I think I already fixed this issue. it is not a real hardware damage (the spi flash corrupted , some bad thing in flashing as you mentioned , may caused by sdcard or the flaky power supply). after checking the docs, this board use winbond spi flash, so my idea is to get rid of /skip the spi flash when boot the board. I removed the captain board and cool fan from the edge board, you will noticed the spi flash at the left lower corner, the 1st pin and second pin for this flash is CS and DO pin, use a tweezer to short-circuit two pins, then you can boot from your emmc or usb drive. If you have system or krescue in emmc or usb drive, pls erase the spi flash first when you boot into the system or kresuce, and set the first boot device to mmc ( normally, board will skip spi flash if it is blank). My board is back now, hope this can help you.
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