Upgrade Unlocked 3GS w/ 4.1 and 05.13.04 firmware

Discussion in 'Jailbreaks and iOS Hacks' started by kwinn, Mar 3, 2011.

  1. kwinn macrumors newbie

    Mar 3, 2011
    Hi - I jailbroke/unlocked my iphone last summer using jailbreakme.com and ultrasn0w and it worked a trick. I really need some of the functionality and access to apps that will only work on 4.2x, but I can't figure out how to upgrade the software without upgrading the baseband. Help?

    thanks so much!
  2. PsstGreek macrumors 68040


    Oct 21, 2010
    Tampa Bay
    You'll need a custom firmware for 4.2.1 to upgrade, keeping your baseband.

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