Technical documents like the UMC TP.MS338.PB801 Main Schematic can assist with hardware-level repairs. How to Install the Firmware
Tech-focused Telegram channels and YouTube tutorials often provide direct links in their descriptions. Download MS338 PB801 1366x768 China M90 Remote part4 rar
The file is one part of a multi-segment firmware archive for the TP.MS338.PB801 Technical documents like the UMC TP