1. I don't know what to tell you to do.
2. Why use Claude AI when there is a perfectly good and updated website? kindlemodding.org; With a PW5 and 5.16.2.1.1, Winterbreak or Winterbreak2 would have been the play I think.
3. Maybe see if there is any information on options on that website for when you've bricked a unit? There is a page there on languagebreak for archival purposes mostly.
https://kindlemodding.org/jailbreaki...uageBreak.html and it has a troubleshooting section....
https://kindlemodding.org/jailbreaki...roubleshooting