BTT V1.1 Visual clues for a burnt board?

Spent two days trying to flash the board that came with my V4 - DFU/SD card no go. All apps upgraded in RatOS, and DFU seems to work when following the OS install guide (jumper removed prior to flashing). Only power and USB-C connected to the board. Flashing process seems to proceed normally, but always end with some form of "can't recognize the board - reflash."

All red lights (3) and a blue light at the SD card port if card is inserted. Curious what you see on a board that has been flashed successfully.
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