If I upgrade to 4.0 from 3.1.3, will I lose my unlock?

Discussion in 'Jailbreaks and iOS Hacks' started by duelingdragons, Jun 23, 2010.

  1. duelingdragons macrumors 65816

    May 13, 2007
    Orlando, FL
    I have a 3GS with new bootrom running 3.1.3..

    I'm selling the phone, and the buyer wants 4.0, doesn't care if its not jailbroken.

    Can I upgrade to 4.0, or will I lose the unlock?
  2. nszzya macrumors member

    Apr 15, 2010
    You will lose the unlock.
  3. Blazing angel macrumors regular

    Jun 19, 2010
    NO, you wont. A new ultrasnow is out, from repo666.ultrasn0w.com

    it unlocks every baseband, including 4.0's 0.5.13
  4. jlmitnick macrumors regular

    Sep 22, 2009
    While it's true that the new ultrasn0w unlocks every baseband, if he upgrades to stock 4.0 and is not jailbroken, he'll have no way to run ultrasn0w and thus lose the unlock.
  5. ryanbates macrumors regular


    May 30, 2010
    San Diego, CA

    True but he states that he has an iPhone 3GS with the new bootrom. Currently the only jailbreak available for the new bootrom is the Spriit Jailbreak and it is not compatible with iOS4. Pwnage and Redsn0w only work with the old bootrom.

    To answer you question duelingdragons, you will have to downgrade the iPhone to 3.1.3 to unlock it. There is currently no way to jailbreak iOS4 with the new bootrom.

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