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Ursprungligen postat av Mr.Sander
Vad menar du med att den inte kan brickas? Sen har jag inte 4.1 utan 3.0.1. Jag vill kunna uppdatera och samtidigt kunna unlocka, annars blir den låst till AT&T. Börjar bli skeptiskt till om det iPhoneköpet från USA var så bra ändå...
SHSH-backups are independant of what firmware you are running.
With TinyUmbrella, you send a restore type of request to Apple with your SHSH. If Apple still sign the firmware in question, tinyumbrella will get a signed SHSH-file in return. Using this, you'll always be able to downgrade/restore to the firmware you backed up the SHSH for, as it can be requested from cydia instead.
Do it quickly. Chances are that Apple are about to roll out a 4.1.1 update that most likely breaks the jailbreak and fixes the bug in the passcode on iPhones.