Once you have the .rar file, follow these steps to update the board:
Extract the .bin firmware file (often named SKR8503_100.bin or similar) from the archive. Download RD8503 General 1920x1080 USB rar
To set a custom boot logo, place a photo on the USB drive, select it in the media player, and use the Capture Logo option in the service menu. Once you have the
). Firmware for this board is typically distributed in .rar or .zip archives containing a .bin file used for USB flashing. Once you have the .rar file
The specific file you are looking for, , is frequently hosted on electronics repair forums and community technical sites: