Definitely sounds like the flash memory got corrupted. I don't know about motu's designs, but devices that I worked on, we always kept the flash downloading function within the bootstrap code and located within the protected boot sector of the flash. If the app goes to hell, the strap would note the bad crc, and default to firmware download mode - usually with some winky-blinky lights going on to make it obvious. Also, we'd make it so that if you turned it on with the correct magic buttons pressed, it'd come up in firmware download mode. I wonder if motu does something like that, and if their tech's or engineers would even acknowledge it...