Quote:
Originally Posted by Cinisajoy
Because an update does not delete stuff.
A factory reset pretty much erases everything and starts fresh.
Oh and might I recommend next time wait until you are sure you don't want to return it before doing anything to it.
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A factory reset restores default user data and private data storage (including the jailbreak bridge which survives firmware updates if not erased). A firmware update then restores a default root filesystem (where the jailbreak and MKK reside). You need to do both in that order to completely remove everything.
It would be possible to create an uninstaller to do this for you, but the two steps work fine when done together as described.