The current printed on the green PCB (e.g., MSD338STV5.0 )

You must download firmware that matches your precise LCD panel resolution (e.g., 1366x768 or 1920x1080).

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This is the most challenging part. CVTE (now part of SigmaStar) does not host public firmware. Instead, you need to source it from:

Keep holding the button until the indicator LED light begins flashing rapidly (red and blue or blinking red).

You must use firmware that matches your screen (e.g., 1366x768 or 1920x1080).

: Do not turn off the power or remove the USB during this time, as it can "brick" the board.