You can find collections of this firmware on community forums like LabOneInside , which hosts a variety of resolution-specific bins for the T-RD8501-03.
Do not turn off the power during this process, as it can "brick" the board. Download RD8501 1400x900 516 00BF CVT 7KEY rar
"7KEY" refers to the configuration for physical buttons (Power, Menu, Vol+/-, Ch+/-, Source). You can find collections of this firmware on
Sandeep. Post Sat Dec 28, 2019 6:14 pm. T-RD8501-03 USB Firmware Software Bios Bin. -1024x768. -1280x768. -1280x1024. -1366x768. - Lab-One Forum T-RD8501-03 USB Firmware Software Bios Bin Sandeep
Reconnect power. The indicator LED (if present) will usually blink rapidly, indicating the update is in progress.
Once the blinking stops or the screen turns on, the update is complete. Reliable Sources
This specific RAR file contains the firmware for the universal LCD/LED controller board, configured for a 1400x900 resolution screen with a 7-key control pad interface. Key Specifications & Context