downgrade iphone 3G with 6.15.00 to OS 2.2.1

Discussion in 'Jailbreaks and iOS Hacks' started by pcmedics911, Feb 21, 2011.

  1. pcmedics911 macrumors newbie

    Jun 4, 2008
    So i was successful at downgrading my iphone 3g from 4.1 to 3.1.2 unlocked. Memory is around 40mb free but when using mail, web and ipod plus phone i end up with 10 or less...starts to lag..etc.

    I'm wondering it its possible to downgrade to ios 2.2.1 with baseband 6.15.00 so i can unlock it with cydia? i know i'll be missing out on a ton of apps but the performance increase might be worth it.

    any thoughts on if this would even be possible?

    thank you
  2. Crystal-RX macrumors 68030


    Dec 22, 2008
    Seattle, WA USA
    Yes, but you have to go the other way. You need to have IOS 4.1 or 4.2.1 into your phone first, then use Redsn0w to upgrade your Iphone baseband to 06.15. The reason for this is because Redsn0w 0.9.6b6 will not recognise IOS below 4.1.

    Once you've done that, your phone has this Ipad baseband so ultrasn0w can unlock it once you jailbreak with lower IOS. you then downgrade your phone to lower IOS.

    I think you should downgrade to 3.1.3 only which is best for Iphone 3G to operate. This is in my opinion only.
  3. Nino3G macrumors newbie


    Jan 18, 2011
    I am also trying to downgrade to 2.2.1 but can't get lower than 3.0

    How can i fix this?
  4. Abs_p macrumors 6502a

    Jul 15, 2011
    I second that. 3.1.3 would be the best or most apps won't run on ur phone...
  5. awadeee macrumors 68020


    Jan 21, 2011
    Viper City
    Why would you want to? The farther down you go, the more functionality you're losing.
  6. userxx macrumors newbie

    Apr 3, 2012
    Would this actually work? Wouldn't the downgrade remove ultrasn0w? Could I install ultrasn0w after downgrading to 2.2.1?

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