Originally Posted by rastik
I'm currently trying to build yifanlu's fastboot tool, that might help too.
Does uboot support USB HID mode? How do you get it into fastboot mode?
Another possibility would be to rebuild /mnt/us using uboot menu, then export it and stick an official amazon firmware image on it. Then use uboot menu to install the firmware package. You would need a full update (not differential) and signed with the amazon key (i.e. "official").
Unfortunately, you can only download firmware for every kindle model EXCEPT the touch:
EDIT: After looking at the available firmware updates above, I see that my v4.0 K4NT can be updated to v4.0.1. Are there any benefits in NOT updating my firmware?