Quote:
Originally Posted by kos25k
Guys df is this? If i un-register it it will delete all my books from internal storage??Maybe jailbreak or even Koreader will be lost? 
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Yes, by default deregister deletes contend of "/mnt/us/documents" where books are, I can't recall if it also clears the whole "/mnt/us" or not.
On a Kindle with jailbreak you can stop it from doing that by running this code (before deregistering

) :
Code:
mntroot rw
touch /var/local/system/DONT_DELETE_CONTENT_ON_DEREGISTRATION
mntroot ro