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Insert the USB into the TV's port while it is unplugged. Plug the TV into power; a flashing standby light usually indicates the update is in progress.
Typically a single BIOS .bin file contained within a .rar archive. Download Sources Download RR8501 C816A 1366x768 rar
Often provides specific BIOS bin and USB firmware software for RR8501 boards . Insert the USB into the TV's port while it is unplugged