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Downgrade iPad Baseband 06.15.00 to 05.13.04 is Very Much Possible!

Posted by Ben on April 9, 2011

WARNING: DO NOT install the iPad baseband on the 3GS. The newer 3GS (week 36 & above of the year 2011 (Serial No:xx136xxxxx)) will DEFINITELY brick your device during 06.15 baseband flash. It has been confirmed to permanently damage the built-in radio hardware, thus rendering it useless pretty much forever. It doesn't matter whether you integrate it into a custom IPSW or use Redsn0w. As of now the only solution is to return to Apple store & get it replaced. The iPad BB unlock solution had its piece of happy times & now its over. So think twice. The older iP3GS's (week 35 & below) are safe. A more detailed discussion about this can be found at JailbreakQA.

MuscleNerd, who happens to be one of the core members of Dev-Team just confirmed that downgrade of iPad baseband 06.15.00 to 05.13.04 is very much possible and is 99% doable. Downgrading iPad baseband back to 05.13.04 will not only fix battery drainage issues but will also help iPhone 3GS/3G users to fix their broken GPS.

iPad Baseband Downgrade Possible

@Kamiela2010 the downgrade potential from 06.15 remains (in my mind) 99% doable, but other things always seem to preempt working on it

In reply to:

@MuscleNerd it seems you guys have no interest in fixing gps issues with 6.15.00. Am I right??

Back in November 2010, Dev-Team released Ultrasn0w 1.2 to unlock iPhone 3GS (Baseband: 04.26.98, 05.11.07, 05.12.01, 05.13.04, 06.15.00) and iPhone 4 (Baseband: 01.59.00) on iOS 4.1 & iOS 4.2.1. Those who were running 05.14.02 or 05.15.04 baseband on their iPhone 3GS/3G were given with an option to upgrade their baseband to iPad baseband 06.15.00 if they want to use Ultrasn0w 1.2 to unlock their iPhone. Upgrading to iPad baseband not only made some iPhone 3GS users to lose their GPS but they also faced severe battery drainage issues.

Upgrading your iPhone 3GS to iOS 4.3 upgrades its baseband to 05.16.01 and restoring stock iOS 4.3.1 upgrades its baseband to 05.16.02. As both of these basebands are < than iPad baseband, so practically it is possible to upgrade them to 06.15.00. Now if you are thinking about upgrading your iPhone 4 (02.10.04, 03.10.01 or 04.10.01) baseband to iPad baseband then don't be too smart because iPhone 3GS/3G basebands do not require SHSH blobs to flash iPad baseband but the iPhone 4 does :P

According to MuscleNerd, instead of working on the unlock of individual baseband (05.14, 05.15 or 05.16), he will devise a single downgrade method for all iPhone 3GS users running iPad baseband. In this way, those iPhone 3GS/3G users who have baseband 05.14.xx, 05.15.xx or 05.16.xx will be able to use Ultrasn0w 1.2 by first upgrading to iPad baseband and then downgrading back to the unlockable baseband 05.13.04.

Conclusion: If you are waiting for the unlock of iPhone 3GS 05.14, 05.15 or 05.16 baseband then forget about it. In either way you MUST first upgrade to iPad baseband and then downgrade back to baseband 05.13.04. The best method to upgrade your iPhone 3GS to iPad baseband is by using Sn0wbreeze 2.5.1. Just download Sn0wbreeze 2.5.1 from here and follow this guide to upgrade your baseband to iPad baseband. If you are on Mac, use Redsn0w 0.9.6b5 instead of using Sn0wbreeze.

Update#1: Fix iPhone 3GS (iPad Baseband) Battery Life Issues on iOS 4.3.3 [Tips]



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  • Hans

    how can I downgrade??? 

    • Anonymous

      It is not possible at the moment. :(

  • wsiddiqui777

    hello again, i successfully upgraded to ios 5 with the new redsn0w with the ipad baseband and have successfully jailbreaked and unlocked my phone. now the only problem that i am experiencing is that when i start a memory intensive app or a app that requires to use my current location, the iphone loses all connectivity, 3g and wifi. i can't seem to figure out the problem as i have tried using a sim that is on the correct carrier without the jailbreak but i am still losing connection.

    is any experiencing this? does anyone know why this might be happening and how i can solve it?

    thanks in advance.

  • Stro87

    ok so you say "The newer 3GS (week 36 & above of the year 2011 (Serial No:xx136xxxxx)) will DEFINITELY brick your device during 06.15 baseband flash." Ok, but to say if i upgrade my 3gs 'week 42 of 2011' to 6.15 to, then to downgrade 05.13, my questions is could that then unbrick the phone?

  • G

    Mine was xx129xxx and it still bricked it.........

  • iphonehackerist

    UMMMMMMMMMMMMMMMMMMMMMMMMM so how do you downgrade from 06.15.00 to a diff baseband? i must be blind or theres a misleading title ...

  • Ramki

    Hi,

    I have an iPhone 3GS that has the following:
    iOS version: 4.1
    Serial Number: 88142******
    Firmware: 5.16.03

    Do we have any mechanism to unlock and jailbreak for this combination? Somewhere I read that for versions later than 35th week cannot be unlocked.

    thanks,
    Ramki.

  • Reinaldo

    I have an iphone 3g 32gb.
    I've had to jailbreak. But the guy's ass used iphone baseband.
    Lost GPS. And the battery does not work more than 6 hours. I do not know if there's something about it.
    The iphone is with version 6.15.00.
    Everything else works normal.

    You can restore the baseband?

    Thanks so much

    • Carlos

      If it helps. I upgraded a 3GS (w ipadbb) with custom 5.0.1 and it fixed the battery drainage. Lasting less than a day, now lasts up to 4 days with no data or 3G connectivity. It's not a fact yet but is very possible that some out there may be fixed as well.

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