Thanks for the jailbreak Marek! First time jailbreaker over here so the guide over at
https://kindlemodding.gitbook.io/kin...4.3-5.16.2.1.1 definitely helped.
One thing I'd like to note is I'd recommend a factory reset before beginning the jailbreak. When I entered demo mode on a Kindle with hundreds of books and 800MB free space I couldn't get to the screen where I could do the secret gesture; the Kindle would just show three images in a slideshow and then bootloop no matter what gestures I made. Eventually I managed to tap so furiously that the slideshow crashed, gave a critical error message, and allowed me to do a factory reset. I really needed that, given that USB wouldn't work and I could get no other input working.
Other than that I had a few instances like KUAL seemingly removing itself along with MRPI after I logged in to my Amazon account, I think, but another round of hotfix resolved that for me.
Overall, thanks again for the jailbreak, and thanks for the instructions. The only bit where I got stuck was with the bootlooping, which may have been disastrous if I hadn't been able to make it crash out.