Introduction
The OSS W09 Pro V3 Battery Programmer is a versatile tool designed for repairing and modifying battery health information on iPhone 11 through 15 Pro Max series mobile phones. It eliminates the need for additional battery flex cables, simplifying the repair process. This device allows users to modify system pop-up windows, adjust battery efficiency and cycle times, read and write battery data, and upgrade firmware via USB connection.

Setup
- Identify Components: Familiarize yourself with the W09 Pro V3 device. It features a mobile phone motherboard battery holder connection, a communication interface, and a battery connection terminal seat.
- Connect Battery: Insert the original battery of the mobile phone into the corresponding battery holder on the right side of the W09. If the battery is implanted with a cell or is in a protected state, the W09 screen may not display immediately.
- Activate Device: If the W09 screen does not display, connect a charger to the mobile phone to provide power and activate the device. The screen should then display normally.
- Connect to Phone: Use the appropriate flex cable to connect the W09 Pro V3 to the mobile phone's motherboard. Ensure the flex cable is securely attached to prevent data read errors.


Operating Instructions
W09 Function Introduction
- Battery pop-up window health repair function.
- Battery test, battery cable reading and writing and modification.
Battery Pop-up Window Health Repair
- Press and hold the phone power button to turn on the phone. If the W09 screen is not bright and you need to plug in the charger, the W09 screen will display and the phone will turn on normally. Because the current is relatively large when the phone is turned on, if the battery power is low, it may cause automatic shutdown after the phone is turned on. Please use the charger to charge the phone when it is turned on. If the USB startup cable is not well connected, or the battery holder is not well connected, the battery core is aging and the voltage is unstable, it may automatically shut down after startup.
- On the W09, navigate to the menu. Select the first option: 'Battery Pop-up Window Health Repair' to set the phone's battery health to 100%.
- The second option, 'Battery Test/Cable Read/Write', is used to modify the default parameters of the external small board. If you want to set the default efficiency to 110%, modify it here.
- The third option, 'Pop-up Status', indicates whether the phone will display an 'Unknown Part' warning. To avoid this, ensure the pop-up status is set to 'No Pop-up Window'.
- Use the '+' and '-' buttons to adjust the required number of cycles. Press 'Confirm' to switch to the battery efficiency, and then modify the required battery efficiency, and press and hold 'Confirm' to write the modified data to the battery cable. (Note that if the number of cycles is less than 21, no matter how the battery efficiency is modified, the battery health in the system settings will display 100 by default, which is a system problem. If the efficiency is to be modified to be less than 100, the number of cycles also needs to be changed to be greater than 20.)
- After successful modification, the W09 will prompt 'Pop-up successful! Please restart your phone!'. Restart the phone to apply changes.
11-15 Series Battery Cable Modification Efficiency Operation Instructions
Connect the battery cable of the same model to the battery, and insert the cable connected to the battery into the test socket of W09. If the battery is in the protection state, it is necessary to install the battery to the mobile phone for charging and activation, or use other instruments to charge and activate the battery (otherwise the instrument will be blank). Follow the instructions for each type of ribbon cable.



The battery health data of the mobile phone system can be updated by installing the flat cable and the battery on the mobile phone and switching on and off twice.
Firmware Upgrade
The W09 Pro V3 supports USB-connected computers for firmware upgrades and to increase functions. It also supports OTA (Over-The-Air) upgrades for future versions.
Maintenance
- Keep the device clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Store the programmer and its accessories in a dry, cool place away from direct sunlight and extreme temperatures.
- Handle flex cables and connectors with care to avoid damage.
Troubleshooting
- W09 Screen Not Displaying: If the W09 screen is blank after connecting the battery, connect a charger to the mobile phone to activate the device. Ensure all connections are secure.
- Incorrect Battery Efficiency Display: If the displayed battery efficiency is not accurate after modification, ensure the cycle count is not set to zero. Setting the cycle count to zero can cause discrepancies between the written and displayed efficiency.
- iPhone 11 Pro/Pro Max Specifics: For iPhone 11 Pro and 11 Pro Max models, two battery card holders are present. One on the motherboard is for power supply, and the other on the tail plug is for data. These models require two different cables (marked A and B) to be connected simultaneously for proper operation.

Specifications
| Attribute | Value |
|---|---|
| Model Number | OSS W09 Pro V3 |
| Application | Household Tool Set, Electrical |
| Material | Plastic |
| Type | Combination |
| Origin | Mainland China |
| Supported iPhone Models | 11-15PM series |
| Package Length | 25 cm |
| Package Width | 20 cm |
| Package Height | 15 cm |
| Package Weight | 0.12 kg |
User Tips
- The W09 Pro V3 is reported to work perfectly across iPhone 11 to 15 Pro Max models, including compatibility with iOS 26.
- This tool is excellent for DIY electrical tasks at home, offering an efficient way to manage battery health.
- Its combination type design makes it suitable for various applications in mobile phone repair.
Warranty and Support
For warranty information and technical support, please refer to the official product page or contact the seller directly. Keep your purchase records for any warranty claims.