I have a similar issue with my PaperWhite, it is stuck on "Repair Needed" screen. Tried factory reset (hold the button for 20-30sec) but no luck. After a boot sequence (the tree with the child reading the book under it, and something moving on the screen), that lasts for about 10sec, the PW returns in the Repair Needed screen. Tried this like 7+ times, no luck..
I had a book that did not want to be opened, I tried to reset the device, but got into this "Repair Needed" screen.
Tried the procedure radioactive76 mentions on post #15, but not sure if I understood completely, does it apply also to Windows OS?
Guys, any other clues?
Many thanks in advance!