Do not power off or remove the USB drive during this process, as it can "brick" the motherboard.
1366x768, 1920x1080, and others via specific firmware. How to Install RD8503 PB819 Firmware Download RD8503 PB819 General 1280x1024 rar
This universal board integrates the power supply, LED driver, and TV signal processor into a single PCB. RDA8503. Do not power off or remove the USB