I can repeatedly (mostly) debrick my k4 (and touch should be the same) using USB (HID) Recovery and fastboot:
https://www.mobileread.com/forums/sho...4&postcount=29
This is even with my serial port RxD line no longer working, so I cannot type u-boot or bist commands (which I now force in custom u-boot images, mostly to get to fastboot mode).
I can reflash my partitions from here. ;-)