The two most common Logitech keyboards are mechanical and membrane, with the primary difference being how the key activates the signal that is sent to your computer.

With membrane, the activation is made between the membrane surface and circuit board and these keyboards can be susceptible to ghosting. When certain multiple keys (usually three or more*) are pressed simultaneously, not all of the keystrokes will appear and one or more may disappear ( ghosted).

An example would be if you would type XML very rapidly but don’t release the X key before pressing the M key and subsequently press the L key, then only X and L would appear.

Logitech Craft, MX Keys and the K860 are membrane keyboards and may experience ghosting. If this is a concern we would recommend to try a mechanical keyboard instead.

*Pressing two modifier keys (Left Ctrl, Right Ctrl, Left Alt, Right Alt, Left Shift, Right Shift and Left Win) together with one regular key should still work as expected.

We’ve identified a few cases where devices aren’t detected in the Logitech Options software or where the device fails to recognize customizations made in the Options software (however, the devices do work in out-of-box mode with no customizations).
Most of the time this happens when macOS is upgraded from Mojave to Catalina/BigSur or when interim versions of macOS are released. To resolve the problem, you can enable permissions manually. Please follow the steps below to remove the existing permissions and then add the permissions. You should then restart the system to allow the changes to take effect.
– Remove existing permissions
– Add the permissions

To remove the existing permissions:
1. Close Logitech Options software.
2. Go to System Preferences -> Security & Privacy. Click the Privacy tab, and then click Accessibility.
3. Uncheck Logi Options and Logi Options Daemon.
4. Click on Logi Options and then click on the minus sign ‘–’ .
5. Click on Logi Options Daemon and then click on the minus sign ‘–’ .
6. Click on Input Monitoring.
7. Uncheck Logi Options and Logi Options Daemon.
8. Click on Logi Options and then click on the minus sign ‘–’.
9. Click on Logi Options Daemon and then click on the minus sign ‘–’.
10. Click Quit and Reopen.

To add the permissions:
1. Go to System Preferences > Security & Privacy. Click the Privacy tab and then click Accessibility.
2. Open Finder and click on Applications or press Shift+Cmd+A from the desktop to open Applications on Finder.
3. In Applications, click Logi Options. Drag and drop it to the Accessibility box in the right panel.
4. In Security & Privacy, click on Input Monitoring.
5. In Applications, click Logi Options. Drag and drop it to the Input Monitoring box.
6. Right-click on Logi Options in Applications and click on Show Package Contents.
7. Go to Contents, then Support.
8. In Security & Privacy, click on Accessibility.
9. In Support, click Logi Options Daemon. Drag and drop it to the  Accessibility  box in the right pane.
10 In Security & Privacy, click on Input Monitoring.
11. In Support, click Logi Options Daemon. Drag and drop it to the Input Monitoring box in the right pane.
12. Click Quit and Reopen.
13. Restart the system.
14. Launch the Options software and then customize your device.

If your MX Keyboard doesn’t turn on the keyboard backlight after you wake it up, we recommend updating the firmware using the instructions below:
1. Download the latest Firmware Update Tool from the download page.
2. If your mouse or keyboard is connected to a Unifying receiver, follow these steps. Otherwise, skip to step 3.
– Make sure to use the Unifying receiver that originally came with your keyboard/mouse.
– If your keyboard/mouse uses batteries, please take the batteries out and put them back in or try replacing them.
– Unplug the Unifying receiver and reinsert it into the USB port.
– Turn off and on the keyboard/mouse using the power button/slider.
– Press any button on the keyboard/mouse to wake up the device.
– Launch the downloaded Firmware Update Tool and follow the on-screen instructions.
3. If your keyboard/mouse still does not work, please reboot your computer and repeat the steps at least two more times.
– If your mouse or keyboard is connected using Bluetooth and is still paired to your Windows or macOS computer:Turn off and on your computer’s Bluetooth or reboot your computer.
– Turn off and on the keyboard/mouse using the power button/slider.
– Launch the downloaded Firmware Update Tool and follow the on-screen instructions.
– If your keyboard/mouse still does not work, please reboot your computer and repeat the steps at least two more times.
4. If your mouse or keyboard is connected using Bluetooth but is no longer paired:
– Remove the Bluetooth pairing from the computer (if any).
– Unplug the Unifying receiver (if any).
– Launch the downloaded Firmware Update Tool and follow the on-screen instructions.
– On the ‘connect receiver’ window, press any button on the keyboard or mouse to wake up the device.
– The devices will be connected and the firmware update should proceed.
– If the issue persists, please contact our customer support team.

It is not possible to use one Easy-Switch button to at the same time change both your mouse and keyboard to a different computer/device.

We do understand that this is a feature that a lot of customers would like. If you are switching between Apple macOS and/or Microsoft Windows computers, we offer Flow. Flow allows you to control multiple computers with a Flow-enabled mouse. Flow automatically switches between computers by moving your cursor to the edge of the screen, and the keyboard follows.

In other cases where Flow is not applicable, one Easy-Switch button for both mouse and keyboard might look like a simple answer. However, we cannot guarantee this solution at the moment, as it is not easy to implement.

If the volume keeps increasing or decreasing after you press the volume button on your MX Keys keyboard, please download the firmware update that addresses this issue.
For Windows
– Windows 7, Windows 10 64-bit
– Windows 7, Windows 10 32-bit
For Mac
– macOS 10.14, 10.15 and 11
NOTE: If the update doesn’t install the first time, please try running it again.

– Make sure that the NumLock key is enabled. If pressing the key once doesn’t enable NumLock, press and hold the key for five seconds.

– Verify that the correct keyboard layout is selected in Windows Settings and that the layout matches your keyboard.
– Try enabling and disabling other toggle keys such as Caps Lock, Scroll Lock, and – – Insert while checking if the number keys work on different apps or programs.
– Disable Turn on Mouse Keys:
1. Open the Ease of Access Center — click the Start key, then click Control Panel > Ease of Access and then Ease of Access Center.
2. Click Make the mouse easier to use.
3. Under Control the mouse with the keyboard, uncheck Turn on Mouse Keys.
– Disable Sticky Keys, Toggle Keys & Filter Keys:
1. Open the Ease of Access Center — click the Start key, then click Control Panel > Ease of Access and then Ease of Access Center.
2. Click Make the keyboard easier to use.
3. Under Make it easier to type, make sure all checkboxes are unchecked.
– Verify the product or receiver is connected directly to the computer and not to a hub, extender, switch, or something similar.
– Make sure the keyboard drivers are updated. Click here to learn how to do this in Windows.
– Try using the device with a new or different user profile.
– Test to see if the mouse/keyboard or receiver on a different computer

On macOS, the Play/Pause and media control buttons by default, launch and control the macOS native Music app. The default functions of keyboard media control buttons are defined and set by macOS itself and therefore cannot be set in Logitech Options.

If any other media player is already launched and running, for example, playing music or a movie onscreen or minimized, pressing the media control buttons will control the launched app and not the Music app.

If you wish your preferred media player to be used with the keyboard media control buttons it must be launched and running.

Apple has announced a forthcoming update macOS 11 (Big Sur) due to be released in the fall of 2020.

If your mouse or keyboard stops working during a firmware update and starts to blink repeatedly red and green, this means the firmware update has failed.

Use the instructions below to get the mouse or keyboard working again. After you download the firmware, select how your device is connected, either using the receiver (Logi Bolt/Unifying) or Bluetooth and then follow the instructions.

1. Download the Firmware Update Tool specific to your operating system.
2. If your mouse or keyboard is connected to a Logi Bolt/Unifying receiver, follow these steps. Otherwise, skip to Step 3.
– Make sure to use the Logi Bolt/Unifying receiver that originally came with your keyboard/mouse.
– If your keyboard/mouse uses batteries, please take the batteries out and put them back in or try replacing them.
– Unplug the Logi Bolt/Unifying receiver and reinsert it into the USB port.
– Turn off and on the keyboard/mouse using the power button/slider.
– Press any button on the keyboard/mouse to wake up the device.
– Launch the downloaded Firmware Update Tool and follow the on-screen instructions.
– If your keyboard/mouse still does not work, please reboot your computer and repeat the steps at least two more times. 
3. If your mouse or keyboard is connected using Bluetooth and is still paired to your Windows or macOS computer:
– Turn off and on your computer’s Bluetooth or reboot your computer.
– Turn off and on the keyboard/mouse using the power button/slider.
– Launch the downloaded Firmware Update Tool and follow the on-screen instructions.
– If your keyboard/mouse still does not work, please reboot your computer and repeat the steps at least two more times. 

Do not remove the device pairing from the System Bluetooth or Logi Bolt when the device is blinking red and green.

If the issue persists, please contact our customer support team.

If you are using Logitech Options or Logitech Control Center (LCC) on macOS you may see a message that legacy system extensions signed by Logitech Inc. will be incompatible with future versions of macOS and recommending to contact the developer for support. Apple provides more information about this message here: About legacy system extensions.

Logitech is aware of this and we are working on updating Options and LCC software to ensure we comply with Apple’s guidelines and also to help Apple improve its security and reliability.

The Legacy System Extension message will be displayed the first time Logitech Options or LCC loads and again periodically while they remain installed and in use, and until we have released new versions of Options and LCC. We do not yet have a release date, but you can check for the latest downloads here.

NOTE: Logitech Options and LCC will continue to work as normal after you click OK.

You can view the available keyboard shortcuts for your external keyboard. Press and hold the Command key on your keyboard to display the shortcuts.

You can change the position of your modifier keys at any time. Here’s how:
– Go to Settings > General > Keyboard > Hardware keyboard > Modifier Keys.

If you have more than one keyboard language on your iPad, you can move from one to the other using your external keyboard. Here’s how:
1. Press Shift + Control + Space bar.
2. Repeat the combination to move between each language.

When you connect your Logitech device, you might see a warning message.
If this happens, make sure to connect only the devices you’ll be using. The more devices that are connected, the more interference you might have between them.
If you are having connectivity issues, disconnect any Bluetooth accessories that you’re not using. To disconnect a device:
– In Settings > Bluetooth, tap the information button next to the device name, then tap Disconnect.

If your Bluetooth mouse or keyboard does not reconnect after a reboot at the login screen and only reconnects after the login, this might be related to FileVault encryption.
When FileVault is enabled, Bluetooth mice and keyboards will only re-connect after login.

Potential solutions:
– If your Logitech device came with a USB receiver, using it will solve the issue.
– Use your MacBook keyboard and trackpad to login.
– Use a USB keyboard or mouse to login.

Note: This issue is fixed from macOS 12.3 or later on M1. Users with an older version might still experience it.

Your mouse can be paired with up to three different computers using the Easy-Switch button to change the channel.

1. Select the channel you want and press and hold the Easy-Switch button for three seconds. This will put the keyboard in discoverable mode so that it can be seen by your computer. The LED will start blinking quickly.
2. Choose between two ways to connect your keyboard to your computer:
– Bluetooth: Open the Bluetooth settings on your computer to complete the pairing. More details here.
– USB receiver: Plug the receiver to a USB port, open Logitech Options, and select: Add devices > Setup Unifying device, and follow the instructions.
3. Once paired, a short press on the Easy-Switch button will allow you to switch channels.

Your keyboard has by default access to the Media and Hotkeys such as Volume Up, Play/Pause, Desktop view, and so on.
If you prefer to have direct access to your F-keys simply press Fn + Esc on your keyboard to swap them.
You can download Logitech Options to get on-screen notifications when you swap from one to the other. Find the software here.

Your keyboard is equipped with a proximity sensor that detects your hands whenever you come back to type on your keyboard.

Proximity detection will not work when the keyboard is charging — you have to press on a key of the keyboard to turn the backlight on. Turning the keyboard backlight off while charging will help with the charging time.

The backlighting will stay on for five minutes after typing, so if you are in the dark, the keyboard won’t turn off while typing

Once charged and the charging cable removed, the proximity detection will work again.

Logitech Options is supported on Windows and Mac only.
You can find out more about Logitech Options features here

Your keyboard is equipped with an ambient light sensor that adapts the keyboard backlight according to the brightness of your room.
There are three default levels that are automatically if you do not toggle the keys:
– If the room is dark, the keyboard will set the backlighting to a low level.
– In a bright environment, it will adjust to a high level of backlighting to add more contrast to your environment.
– When the room is too bright, over 200 lux, the backlighting will turn off as the contrast is no longer visible, and it won’t drain your battery unnecessarily.

When you leave your keyboard but keep it on, the keyboard detects when your hands approach and it will turn the backlight back on. The backlighting won’t turn back on if:

– Your keyboard has no more battery, below 10%.
– If the environment you’re in is too bright.
– If you’ve turned it off manually or using Logitech Options software.

Your keyboard backlight will automatically turn off under the following conditions:
– The keyboard is equipped with an ambient light sensor — it assesses the amount of light around you and adapts the backlight accordingly. If there is enough light, it turns the keyboard backlight off to prevent draining the battery.
– When your keyboard’s battery is low, it turns the backlight off to allow you to continue working without disruption.

Each USB receiver can host up to six devices.
To add a new device to an existing USB receiver:
1. Open Logitech Options.
2. Click Add Device, and then Add Unifying device.
3. Follow the on-screen instructions.

NOTE: If you don’t have Logitech Options you can download it here.
You can connect your device with a Unifying receiver other than the one included with your product.

You can determine if your Logitech devices are Unifying by the logo in orange on the side of the USB receiver:

– INTRODUCTION
– HOW IT WORKS
– WHAT SETTINGS GET BACKED UP 

INTRODUCTION
This feature on Logi Options+ allows you to backup the customization of your Options+ supported device automatically to the cloud after creating an account. If you are planning to use your device on a new computer or wish to go back to your old settings on the same computer, log into your Options+ account on that computer and fetch the settings you want from a backup to set up your device and get going.

HOW IT WORKS
When you are logged into Logi Options+ with a verified account, your device settings are automatically backed up to the cloud by default. You can manage the settings and the backups from the Backups tab under More settings of your device (as shown):


Manage settings and backups by clicking on More > Backups:

AUTOMATIC BACKUP OF SETTINGS — if the Automatically create backups of settings for all devices checkbox is enabled, any settings you have or modify for all of your devices on that computer are backed up to the cloud automatically. The checkbox is enabled by default. You can disable it if you don’t want the settings of your devices to be backed up automatically.

CREATE A BACKUP NOW — this button allows you to backup your current device settings now, if you need to fetch them later.

RESTORE SETTINGS FROM BACKUP — this button lets you view and restore all the available backups you have for that device that are compatible with that computer, as shown above.

The settings for a device are backed up for every computer that you have your device connected to and have Logi Options+ that you are logged into. Every time you make some modifications to your device settings, they get backed up with that computer name. The backups can be differentiated based on the following:
1. Name of the computer. (Ex. John’s Work Laptop)
2. Make and/or model of the computer. (Ex. Dell Inc., Macbook Pro (13-inch) and so on)
3. The time when the backup was made

The desired settings can then be selected and restored accordingly.

WHAT SETTINGS GET BACKED UP
– Configuration of all the buttons of your mouse
– Configuration of all the keys of your keyboard
– Point & Scroll settings of your mouse
– Any application-specific settings of your device

WHAT SETTINGS ARE NOT BACKED UP
– Flow settings
– Options+ app settings

Likely Cause(s):
– Potential hardware issue
– Operating system /software settings
– USB port issue

Symptom(s):
– Single-click results in double-click (mice and pointers)
– Repeating or strange characters when typing on the keyboard
– Button/key/control gets stuck or responds intermittently

Possible solutions:
– Clean the button/key with compressed air.
– Verify the product or receiver is connected directly to the computer and not to a hub, extender, switch or something similar.
– Unpair/repair or disconnect/reconnect hardware.
– Upgrade firmware if available.
– Windows only — try a different USB port. If it makes a difference, try updating the motherboard USB chipset driver.
– Try on a different computer. Windows only — if it works on a different computer, then the issue might be related to a USB chipset driver.

*Pointing devices only:
– If you’re not sure if the problem is a hardware or software issue, try switching the buttons in the settings (left click becomes right click and right click becomes left click). If the problem moves to the new button it is a software setting or application issue and hardware troubleshooting cannot resolve it. If the problem stays with the same button it is a hardware issue.
– If a single-click always double-clicks, check the settings (Windows mouse settings and/or in Logitech SetPoint/Options/G HUB/Control Center/Gaming Software) to verify if the button is set to Single Click is Double Click.

NOTE: If buttons or keys respond incorrectly in a particular program, verify if the problem is specific to the software by testing in other programs.

Likely Cause(s)
– Potential hardware issue
– Interference issue
– USB port issue

Symptom(s)
– Typed characters take a few seconds to appear on the screen

Possible solutions
1. Verify the product or receiver is connected directly to the computer and not to a hub, extender, switch or something similar.
2. Move the keyboard closer to the USB receiver. If your receiver is in the back of your computer, it may help to relocate the receiver to a front port. In some cases the receiver signal gets blocked by the computer case, causing a delay. 
3. Keep other electrical wireless devices away from the USB receiver to avoid interferences.
4. Unpair/repair or disconnect/reconnect hardware.
– If you have a Unifying receiver, identified by this logo,  see Unpair a mouse or keyboard from the Unifying receiver.
5. If your receiver is non-Unifying, it cannot be unpaired. However, if you have a replacement receiver, you can use the Connection Utility software to perform the pairing.
6. Upgrade the firmware for your device if available.
7. Windows only — check if there are any Windows updates running in the background that may cause the delay.
8. Mac only — check if there are any background updates that may cause the delay.
Try on a different computer.

If you’re unable to pair your device to the Unifying receiver, please do the following:

STEP A: 
1. Make sure the device is found in Devices and Printers. If the device is not there, follow steps 2 and 3.
2. If connected to a USB HUB, USB Extender or to the PC case, try connecting to a port directly on the computer motherboard.
3. Try a different USB port; if a USB 3.0 port was used previously, try a USB 2.0 port instead.

STEP B:
Open Unifying Software and see if your device is listed there. If not, follow the steps to connect the device to a Unifying receiver.

If your device stops responding, confirm that the USB receiver is working properly.

The steps below will help to identify if the issue is related to the USB receiver:
1. Open Device Manager and make sure your product is listed. 
2. If the receiver is plugged into a USB hub or extender, try plugging it into a port directly on the computer
3. Windows only — try a different USB port. If it makes a difference, try updating the motherboard USB chipset driver.
4. If the receiver is Unifying, identified by this logo,  open Unifying Software and check if the device is found there.
5. If not, follow the steps to connect the device to a Unifying receiver.
6. Try using the receiver on a different computer.
7. If it’s still not working on the second computer, check Device Manager to see if the device is recognized.

If your product is still not recognized, the fault is most likely related to the USB receiver rather than the keyboard or mouse.

If you are having difficulty establishing a connection between two computers for Flow, follow these steps:
1. Check both systems are connected to the internet:
– On each computer, open a web browser and check the internet connection by navigating to a webpage.
2. Check that both computers are connected to the same network: 
– Open the Terminal: For Mac, open your Applications folder, then open the Utilities folder. Open the Terminal application.
– In the Terminal, type: Ifconfig
– Check and note the IP address and Subnet mask. Make sure that both systems are in the same Subnet.
3. Ping the systems by IP address and make sure that ping works:
– Open the Terminal and type ping <IP address>  [Where the <IP address is the IP address of the other computer noted in Step 2 above]4. Check that the Firewall and Ports are correct:
Ports used for Flow:
TCP : 59866
UDP : 59867,59868
1. Open the Terminal and type the following cmd to show the ports in use:
> sudo lsof +c15|grep IPv4
2. This is the expected result when Flow is using the default ports:
NOTE: Normally Flow uses the default ports but if those ports are already in use by another application Flow might use other ports.
3. Check that the Logitech Options Daemon is added automatically when Flow is enabled:
– Go to System Preferences > Security & Privacy
– In Security & Privacy go to the Firewall tab. Make sure the Firewall is on, then click on Firewall Options. (NOTE: You may have to click the lock in the bottom left corner to make changes which will prompt you to enter the account password.)

NOTE: On macOS, the firewall default settings automatically allow ports opened by signed apps through the firewall.  As Logi Options is signed it should be added automatically without prompting the user.

4. This is the expected result: The two “Automatically allow” options are checked by default. The “Logitech Options Daemon” in the list box is added automatically when Flow is enabled.
5. If Logitech Options Daemon is not there, try the following:
– Uninstall Logitech Options
– Reboot your Mac
– Install Logitech Options again
6. Disable Antivirus and reinstall:
– Try disabling your Antivirus program first, then reinstall Logitech Options.
– Once Flow is working, re-enable your Antivirus program.

If you are having difficulty establishing a connection between two computers for Flow, follow these steps:
1. Check both systems are connected to the internet:
– On each computer, open a web browser and check the internet connection by navigating to a webpage.
2. Check both computers connected to the same network: 
– Open a CMD prompt/Terminal: Press Win+R to open Run.
– Type cmd and click OK.
– In the CMD prompt type: ipconfig /all
– Check and note the IP address and Subnet mask. Make sure that both systems are in the same Subnet.
3. Ping the systems by IP address and make sure that ping works:
– Open a CMD prompt and type: ping <IP address>   [Where the <IP address is the IP address of the other computer noted in step 2 above].
4. Check that the Firewall & Ports are correct:
Ports used for Flow:
TCP : 59866
UDP : 59867,59868
– Check the port is allowed: Press Win + R to open Run
– Type wf.msc and click OK. This should open “Windows Defender Firewall with Advanced Security” window.
– Go to Inbound Rules and make sure LogiOptionsMgr.Exe is there and is allowed

Example: 

5. If you don’t see the entry, it could be that one of your antivirus/firewall applications are blocking the rule creation, or you were initially denied access. Try the following:
1. Disable the antivirus/firewall application temporarily.
2. Recreate the firewall inbound rule by:
– Uninstalling Logitech Options
– Reboot your computer
– Make sure the antivirus/firewall app is still disabled
– Install Logitech Options again
– Re-enable your antivirus

These troubleshooting steps go from easy to more advanced. 
Please follow the steps in order and check if the device works after each step.

Make sure you have the latest version of macOS
Apple is regularly improving the way macOS handles Bluetooth devices.
Click here for instructions on how to update macOS. 

Make sure you have the right Bluetooth parameters
1. Navigate to the Bluetooth preference pane in System Preferences:
– Go to Apple Menu > System Preferences > Bluetooth 
2. Make sure that Bluetooth is turned On. 
3. In the bottom-right corner of the Bluetooth Preference window, click Advanced. 
4. Make sure all three options are checked: 
– Open Bluetooth Setup Assistant at startup if no keyboard is detected 
– Open Bluetooth Setup Assistant at startup if no mouse or trackpad is detected 
– Allow Bluetooth devices to wake this computer 
NOTE: These options ensure that Bluetooth-enabled devices can wake your Mac and that the OS Bluetooth Setup Assistant will launch if a Bluetooth keyboard, mouse or trackpad is not detected as connected to your Mac.
5. Click OK.

Restart the Mac Bluetooth Connection on your Mac
1. Navigate to the Bluetooth preference pane in System Preferences:
– Go to Apple Menu > System Preferences > Bluetooth
2. Click Turn Bluetooth Off. 
3. Wait a few seconds, and then click Turn Bluetooth On. 
4. Check to see if the Logitech Bluetooth device is working. If not, go to the next steps.
Remove your Logitech device from the list of devices and try to pair again

1. Navigate to the Bluetooth preference pane in System Preferences:
– Go to Apple Menu > System Preferences > Bluetooth
2. Locate your device in the Devices list, and click on the “x” to remove it. 

3. Re-pair your device by following the procedure described here.

Disable the hand-off feature
In some cases, disabling the iCloud hand-off functionality can help.
1. Navigate to the General preference pane in System Preferences: 
– Go to Apple Menu > System Preferences > General 
2. Make sure Handoff is unchecked. 
Reset the Mac’s Bluetooth settings

WARNING: This will reset your Mac, and cause it to forget all of the Bluetooth devices you have ever used. You will need to re-configure each device.

1. Make sure Bluetooth is enabled and that you can see the Bluetooth icon in the Mac Menu Bar at the top of the screen. (You’ll need to check the box Show Bluetooth in menu bar in the Bluetooth preferences).

2. Hold down the Shift and Option keys, and then click the Bluetooth icon in the Mac Menu Bar.
 
3. The Bluetooth menu will appear, and you will see additional hidden items in the drop-down menu. Select Debug and then Remove all devices. This clears the Bluetooth device table and you’ll then need to reset the Bluetooth system. 
4. Hold down the Shift and Option keys again, click on the Bluetooth menu and select Debug > Reset the Bluetooth Module. 
5. You will now need to repair all your Bluetooth devices following standard Bluetooth pairing procedures.

To re-pair your Logitech Bluetooth device:

NOTE: Make sure all your Bluetooth devices are on and have enough battery life before you re-pair them.

When the new Bluetooth Preference file is created, you’ll need to re-pair all your Bluetooth devices with your Mac. Here’s how:

1. If the Bluetooth Assistant starts up, follow the onscreen instructions and you should be ready to go. If the Assistant doesn’t appear, go to Step 3.
Click Apple > System Preferences, and select the Bluetooth Preference pane.
2. Your Bluetooth devices should be listed with a Pair button next to each unpaired device. Click Pair to associate each Bluetooth device with your Mac.
3. Check to see if the Logitech Bluetooth device is working. If not, go to the next steps.

Delete your Mac’s Bluetooth Preference List
The Mac’s Bluetooth Preference List may be corrupted. This preference list stores all the Bluetooth devices pairings and their current states. If the list is corrupted, you’ll need to remove your Mac’s Bluetooth Preference List and re-pair your device.

NOTE: This will delete all pairing for your Bluetooth devices from your computer, not just Logitech devices.
1. Click Apple > System Preferences, and select the Bluetooth Preference pane.
2. Click Turn Bluetooth Off. 
3. Open a Finder window and navigate to the /YourStartupDrive/Library/Preferences folder. Press Command-Shift-G on your keyboard and enter /Library/Preferences in the box.
Typically this will be in /Macintosh HD/Library/Preferences. If you changed the name of your startup drive, then the first part of the pathname above will be that [Name]; for example, [Name]/Library/Preferences.
4. With the Preferences folder open in the Finder, look for the file called com.apple.Bluetooth.plist. This is your Bluetooth Preference List. This file could be corrupted and cause problems with your Logitech Bluetooth device.
5. Select the com.apple.Bluetooth.plist file and drag it to the desktop. 
NOTE: This will create a backup file on your desktop if you ever want to go back to the original setup. At any point, you can drag this file back to the Preferences folder.
6. In the Finder window that is open to the /YourStartupDrive/Library/Preferences folder, right-click the com.apple.Bluetooth.plist file and select Move to Trash from the pop-up menu. 
7. If you are asked for an administrator password to move the file to the trash, enter the password and click OK.
8. Close any open applications, then restart your Mac. 
9. Re-pair your Logitech Bluetooth device.

Specifications

Dear customer, by default the media keys are active on the keyboard. You will need to switch to the F keys by pressing Fn + Esc combination. You can also customize other button to provide the F4 command via Logitech Options software.

The function keys on a computer keyboard labelled F1 through F12, are keys that have a special function defined by a currently running program or by the operating system. They can be combined with the Ctrl or Alt keys.

The device is sometimes called an eraser pointer because it is roughly the size and shape of a pencil eraser. It has a replaceable red tip (called a nipple) and is located in the middle of the keyboard between the G, H, and B keys. The control buttons are located in front of the keyboard toward the user.

Keyboard is the fact that it’s backlit. And as you can see when you first turn it on it will flash that light for you and all you need to do is set it up by the normal setup with whatever the.

If you want backlight back, plug your keyboard to charge. When the environment around you is too bright, your keyboard will automatically disable backlighting to avoid using it when not needed. This will also allow you to use it longer with backlight in low light conditions.

Hello, the MX Keys is not a waterproof or spill proof keyboard.

The status light on your keyboard will flash while the battery is charging. The light will turn solid when it’s fully charged.

Hello, Yes, you can use the MX Keys while it is plugged in and charging. Sorry, there was a problem.

To check the battery status, on the main page of Logitech Options, select your device (mouse or keyboard). Battery status will be shown on the lower part of the Options window.

Blinking red means the battery is low.

Press and hold the FN key, then press the F12 key: If the LED glows green, the batteries are good. If the LED blinks red, the battery level is low and you should consider changing batteries. You can also turn the keyboard off then back on using the On/Off switch on top of the keyboard.

The blinking light is telling you it is not paired to your device.

Unpair your keyboard from Bluetooth settings.
Press the following keys in this order: esc O esc O esc B.
The lights on the keyboard should flash multiple times.
Turn off and on the keyboard, and all devices in easy-switch should be removed.

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