not sure if that would be possible. did you mess with the partition table? if not - try my updated 1.04 recovery image...
https://www.mobileread.com/forums/sho...d.php?t=178263
also, i can make an image that will recover kernel and root partition, but I cannot guarantee that it will work.
but if your partition table is corrupted, the reader can only be recovered manually by someone familiar with linux systems.