@gmask: You're gonna need to remember exactly *which* jailbreak you used, because if you tried my latest uninstaller and your device is still jailbroken, then it wasn't mine

.
Hint:
https://www.mobileread.com/forums/sho...d.php?t=122519
And *restart* your Kindle after the uninstall.
@knc1: The FW 3.x jailbreaks are trickier than that

. There's no concept of dev private key, so we're bind-mounting our custom key on top the one of Amazon's one dynamically, right before the updater launches, if we detect a custom update package

.
That means some versions have a 'broken' uninstaller that doesn't restore the default keys after the uninstall process, hence the need for a full restart to kill the bind mount.