1. Introduction
This manual provides detailed instructions for setting up and using your VKTECH MF800B H5577 4G Mobile WiFi Router USB Dongle. This device offers high-speed 4G LTE connectivity, allowing you to create a portable Wi-Fi hotspot for multiple devices. Whether you have the portable MiFi router (H5577) with a built-in battery or the USB dongle (MF800B) that draws power from a USB source, this guide will help you get connected quickly and efficiently.
Enjoy fast and reliable internet access with speeds of up to 150 Mbps DL and 50 Mbps UL, ensuring smooth browsing, streaming, and downloading experiences. The device supports the 802.11b/g/n WiFi standard and MIMO technology for stable wireless connections.
2. Package Contents
Please check the box for the following items:
- 1 x 4G Mobile WiFi Router (MF800B USB Dongle or H5577 Portable MiFi Router)
- 1 x Battery (for H5577 Portable MiFi Router only)
- 1 x Data Cable
- 1 x Instruction Manual

3. Specifications
| Feature | Specification |
|---|---|
| Model | H5577 (Portable MiFi Router) / MF800B (USB Dongle) |
| Brand Name | VKTECH |
| Color | White (H5577), Black/White (MF800B) |
| Support 4G Frequency Band | B1/B3/B5/B40 |
| DD-LTE Speed | Cat4 130 Mbps DL / 35 Mbps UL |
| FDD-LTE Speed | Cat4 150 Mbps DL / 50 Mbps UL |
| WiFi Standard | 802.11b/g/n1"1 |
| WCDMA Speed | Downlink 21 Mbps / UL 5.76 Mbps |
| 3GPP/3GPP2 Protocol | LTE FDD/TDD version 9 |
| Maximum WiFi Users | 8-10 |
| RF Chip | RTR1605 |
| Wireless MIMO Technology | Supported |
| TDD-LTE Wireless Transmission Power | 21dbm ± 2dbm |
| FDD-LTE Wireless Transmission Power | 21dbm ± 2d |
| WCDMA Wireless Transmission Power | 2ldbm ± 2db |
| WiFi Frequency | 2.4GHz |
| Interface | USB |
| Compatibility | WEB Cross-browser compatibility |
| Battery (H5577 only) | 2100mAh lithium battery |
| Working Temperature | -10 °C to 60 °C |
| Working Humidity | 5% - 65% |
| Storage Temperature | -30 °C to 80 °C |
| Storage Humidity | 5% to 95% |
| Product Size (H5577) | 98 x 53 x 8mm (3.86 x 2.09 x 0.31in) |
| Product Size (MF800B) | 95 x 33mm (3.74 x 1.30in) |


4. Setup Guide
Follow these steps to set up your 4G Mobile WiFi Router:
4.1. SIM Card Insertion
- For H5577 Portable MiFi Router: Gently push down the rear cover to open the battery compartment. Insert the SIM card with the card core facing downwards into the designated slot. Ensure the battery is also correctly inserted.
- For MF800B USB Dongle: Remove the USB cap. Locate the SIM card slot, usually on the side or under a removable panel. Insert the SIM card with the card core facing downwards.

4.2. Powering On
- For H5577 Portable MiFi Router: Press and hold the power button until the device powers on and the screen illuminates.
- For MF800B USB Dongle: Insert the USB dongle into a power source such as a USB wall adapter, car charger, mobile power bank, or computer USB port. The device will power on automatically.

5. Operation
5.1. Connecting to Wi-Fi
- Once the device is powered on and has established a 4G connection (indicated by the signal lights or screen display), it will broadcast a Wi-Fi network.
- On your smartphone, tablet, or computer, search for available Wi-Fi networks.
- Locate the network name (SSID) and password (WIFI KEY) printed on the device label (usually inside the battery compartment for H5577 or on the back/side for MF800B).
- Select the network and enter the Wi-Fi password to connect.

5.2. Accessing the Web Management Interface
To customize settings such as Wi-Fi name, password, or APN settings:
- Connect your device (smartphone, tablet, or computer) to the router's Wi-Fi network.
- Open a web browser and enter the router's IP address:
192.168.100.1(or as specified on the device label). - Enter the login password, which is typically
admin(or as specified on the device label). - From the web interface, you can modify Wi-Fi settings, change the login password, configure APN settings, and view network status.
6. User Tips
- Optimal Placement: For the best signal, place your MiFi router or USB dongle in an open area, away from obstructions and other electronic devices that might cause interference.
- Power Source: The MF800B USB dongle is highly versatile and can be powered by various USB sources, including car chargers, mobile power banks, and laptop USB ports, making it ideal for travel.
- Battery Life (H5577): To maximize battery life on the H5577, consider reducing the number of connected devices or disabling Wi-Fi when not in use.
- Network Compatibility: Before using, ensure your SIM card's network frequency bands are compatible with the device and your local operator. Refer to the 'List of LTE Networks Reference' image below for guidance.

7. Troubleshooting
If you encounter issues with your device, try the following:
- No Internet Connection:
- Ensure the SIM card is correctly inserted and activated with an active data plan.
- Check the signal strength indicator on the device. If the signal is weak, try moving to a different location.
- Verify APN settings in the web management interface. These settings are usually provided by your mobile network operator.
- Restart the device and your connected client device.
- Cannot Connect to Wi-Fi:
- Double-check the Wi-Fi SSID and password.
- Ensure your client device is within the Wi-Fi range.
- Restart the router.
- Slow Speed:
- Check your 4G signal strength.
- Reduce the number of connected devices.
- Ensure your data plan has sufficient speed and data allowance.
- Device Not Powering On (MF800B USB Dongle):
- Ensure the USB power source is active and providing sufficient power. Try a different USB port or adapter.
- Device Not Powering On (H5577 Portable MiFi Router):
- Ensure the battery is charged and correctly inserted.
- Try charging the device for a while before attempting to power it on again.
8. Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Do not use liquid cleaners or aerosols.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Handling: Avoid dropping the device or exposing it to strong impacts.
- Battery Care (H5577): If the device will not be used for an extended period, charge the battery to about 50% and store it separately if possible. Recharge every few months to prevent deep discharge.
9. Warranty and Support
Your VKTECH 4G Mobile WiFi Router is designed for reliability and performance. For any technical issues or support inquiries not covered in this manual, please refer to the seller's support channels or contact the manufacturer directly. Keep your proof of purchase for warranty claims.