The indicator light (LED) will begin to flash . This indicates the update is in progress.
What is your (found on the back of the LCD screen)? What is the native resolution of your screen?
The T.VST29.03 is one of the most common universal LCD/LED TV controller boards used in the repair and DIY monitor industry. Since these boards are designed to support a vast array of screen panels from different manufacturers, flashing the correct firmware is the most critical step in getting your display to work correctly.