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I have an iPhone 3GS running on 4.0.1 and I want to upgrade it to 4.2 with my Mac. How can I go about doing this?

  • Current Version: 4.0.1 (8A306)
  • Model: MB7...
  • Modem Firmware: 05.13.04

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There is nothing special to upgrading when jailbroken or not. You must use the official upgrade path which means losing unlock and jailbreak, and then re-jailbreak and re-unlock if you want and if it is possible with the new firmware. So...

  1. Plug it in
  2. Follow the prompts in iTunes
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  • Is it possible with the new firmware? I thought there was something special that you had to do. Commented Jan 18, 2011 at 1:49
  • @michael it is possible and there is something special, only about 3GS. for more info: apple.stackexchange.com/questions/5264/…
    – cregox
    Commented Jan 19, 2011 at 1:33

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