Quote:
Originally Posted by veezh
It worked for me, but it took several attempts.
Be sure to follow the instructions exactly about rebooting the Kindle manually *before* disconnecting it from your computer.
Then install the back door lock. 
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The downgrader from Ameho won't work on 5.4.5.x as the new firmwares can't be jailbroken.
Fortunately the noeject-and-reboot trick is universal and works without any helper hacks or other preconditions.