Quote:
Originally Posted by tejastonto
If you upgrade the firmware via iTunes you lose all your non Apple-sanctioned stuff. I think what you have to do is download the 2.1 firmware, jailbreak it, and then restore using that custom ipsw. The only problem I'm having is finding a program to customize the ipsw.. winpwn doesn't seem allow me to load it.
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that part i know but what about the mobile substrate file? does that get a fresh install once you restore or does it restore it with the same file you always had?