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Place the firmware file (usually named allupgrade_...bin or similar) directly into the root directory of the USB drive. Flashing Process: Power off the TV and unplug the power cord. Insert the USB drive into the TV's USB port.

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.

during this process, as it can "brick" the motherboard.