Quote:
Originally Posted by mergen3107
The file you are looking for is called fixup. It lives in /var/local/system/ after JB
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Thank you!
Quote:
Originally Posted by j.p.s
Kindles don't have factory reset (flash original firmware), they have plain reset, which resets all configurations to default, clears all the sqlite databases in /var, and erases all user data in /mnt/us, which is the partition exported over USB mass storage.
The essential effect of the jailbreak process is to get a community developer key into /etc/uks, which can only be done by exploiting some vulnerability. Over time, functionality was added to squirrel away the ability to restore the developer key during a restart (reboot) after a firmware update or a reset. If an update is followed by a reset without a restart, or vice versa, bye bye jailbreak.
The developer key is needed because only packages signed by a key in /etc/uks can be installed. Of course, once USBnetworking or a terminal emulator is installed, / can be mounted rw long enough to put anything you want anywhere you want.
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Thanks for the detailed explanation.