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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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