Future-proofing the 3GS jailbreak
If there’s one thing we’ve been stressing the last few weeks, it’s that if you want to keep the jailbreak or unlock on your 3GS, you should resist all urges to install Apple’s official firmware updates without knowing if a jailbreak exists for that version yet. Unless another (different) bootrom exploit is found for the 3GS that doesn’t require a “foot in the door” with a signed official iBoot, then accepting official updates willy-nilly may cause you to be cutoff from the jailbreak. And it will definitely cause you to be cutoff from the carrier unlock.
Now, there are ways to ensure that even after taking an official 3GS update (which you really shouldn’t do!), that you’ll nonetheless be able to revert to a jailbreakable 3GS (this is NOT true for the unlock, see NOTE #1 below). We’ve been explaining these methods (like the iTunes /tmp technique) over the last few weeks, and there’s been some great discussion and feedback for the methods in the comments.
Having said all that, we realize that some of you updated your 3GS to 3.1 anyway. If you want to come back to the world of the jailbreak (but NOT the sim unlock, sorry!) then saurik’s new “on file” server may be able to help. He’s Read more…