Use the remote control volume or channel buttons to navigate through the Android Recovery menu.
Create a folder in the root directory named exactly upgrade . Copy your downloaded firmware file into the upgrade folder.
A key feature of many custom firmwares is the ability to install apps automatically. Create a folder named in the root of your USB drive, place your .apk files inside, and plug the drive into your Huawei STB. The system should automatically detect and install them.
Ensure you have the exact firmware for the EC6108V9 model. Using firmware meant for a different variant (like the V9U or V9C) can permanently damage the hardware. pinout diagram for a TTL connection?