Same here, my POD HD pro X stopped working, it is in constant reboot loop.
I tried the factory reset (left arrow at start). Fails due to reboot.
I can get it to "update flash", see the pic below, but allway I get an error code: Code: 80007211
I tried 3 laptops, win10, win7, win xp. all the USB ports, few different cables.
I also tried to upload older flash version (2.32.00 FILE ) no luck...
Self test is telling me the flash memory test passed.
Any other suggestion please?