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:
Quote:
Firmware version: 5.1.2
JBPatch: 6/7 (2.4.1)
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So is there anyway for me to uninstall JB and its related content (i.e factory reset) other than debricking?

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