Finding official firmware for universal Chinese boards like the RD8501 can be difficult, as they are often distributed through technician forums and Telegram channels.
Sites like Lab-One Forum often host BIOS bin files and USB firmware for various RD8501 series boards. Download RD8501 568 1920x1080 USB rar
Use a tool like WinRAR or 7-Zip to extract the .bin file from the downloaded .rar archive. Finding official firmware for universal Chinese boards like