Quote:
Originally Posted by elfleaf
Hello, I've just got a 2nd hand Kindle Touch  :
I noticed that the previous user had installed an old version of jailbreak with UI, collection manager and stuffs.
The problem is that the Kindle is not working properly (slow and even freeze sometimes). I guess it's because of some software conflicts and would like to reset it and reinstall newer jailbreak version.
I have contacted the previous user but he doesn't remember which jailbreak version he installed (it was ~4 years ago). In the "Device info" section it says:
So is there anyway for me to uninstall JB and its related content (i.e factory reset) other than debricking? 
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The jail break CAN NOT be your problem.
The "stuffs" are not likely, but update them anyway.
The most likely source of your problem is an aging eMMC chip (one with bad erase blocks - - the flash storage version of sectors).
IF you try to re-write the image file, you are very likely to find the process will fail.
Leaving you a used screen to re-sell.
But if you feel you absolutely must re-install, use Kubrick (see sticky atop index page).