Groups like "lcd tv led tv smart tv software" frequently host collections of these .rar files, including resolutions like 1366x768 . How to Install (USB Method)
Because these boards are generic, official manufacturer websites do not exist. Instead, firmware is hosted on community repair forums and Telegram channels:
If the board still does not power on after flashing, check voltage details like the 5V and 12V rails on the motherboard.
Ensure the file name is correct (often just allupgrade_8501.bin or similar, depending on the board instructions).
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Often provides specific BIOS bin and USB firmware software for RR8501 boards .
Always back up your original firmware if possible, as installing the wrong resolution or software can cause the screen to display distorted images or fail to boot.
Once the light stops flashing or changes color, remove the USB and restart the TV. Important Safety Information