Feedback on PPW4 jailbrocken and on 5.12.1
Delete the folder named "update.bin.tmp" (*******Must be*****).
Install lastes HOTFIX update from
https://www.mobileread.com/forums/sh...d.php?t=225030
Reboot and make sure this file on your screen. (Kindle Feedback)
It's safe to manual update your device to 5.12.2