how to upgrade 3gs 4.2.1 to ios5 06.15.00 basebamd

Discussion in 'Jailbreaks and iOS Hacks' started by perezmarco, Nov 22, 2011.

  1. perezmarco macrumors member

    Dec 28, 2009
    hello. I want to update my iPhone 3GS to iOS 5 and maintain the unlock. It currently has the 06.15.00 baseband and is unlocked and jailbroken on 4.2.1. How would I go about this? How would I do it to keep the unlock but still update?
  2. nawras94 macrumors member

    Apr 21, 2011
    if you have ipad baseband always use snowbreeze to build a ipsw
    then go to cydia install ultrasnow
    and put your sim card

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