How to Downgrade iPhone 3.1 Baseband From 05.11.07 to 04.26.08

By , Sep 29, 2009

Every time there is a new firmware coming out, updating puts you at risk of updating your baseband as well, making it impossible to unlock your iPhone. This time is no different than the others and many people accidentally updated their iPhone to firmware 3.1, updating their baseband to 05.11.07 at the same time.

Fortunately, there is an easy way for iPhone 3G users to downgrade their baseband from 05.11.07 to 04.26.08. Note that this is for iPhone 3G users only. If you have an iPhone 3GS, then read my article on how to downgrade the iPhone 3GS firmware from 3.1 to 3.0.

Note that this trick only works on iPhones that have the 05.08 (5.8) bootloader from the factory, which is just a very limited amounts of iPhone 3G that were released in the first few weeks of the production cycle. If you don’t know your bootloader version, you may run Fuzzyband and it will tell you what version you have and whether or not you can downgrade your baseband.

1. First, your iPhone 3G has to be jailbroken. For more information, read my iPhone 3.1 jailbreak article.

2. Launch Cydia and search for the Fuzzyband app. Install it and reboot your iPhone.

3. Launch the Fuzzyband app and tap “downgrade” to start downgrading your baseband from 05.11.07 to 04.26.08.

4. Reboot your iPhone. You should now be on baseband 04.26.08 and be able to jailbreak and unlock your iPhone using UltraSn0w.

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  • DavidG

    The article is incomplete. Downgrading is possible only on phones with an older bootloaders (v5.08 or older). Phones with newer bootloaders are, AFAIK, out of luck. Please include mention of this in the main article.

  • DavidG,

    Have you read the last paragraph?

    Seb

  • iPhone 3GS

    Seb,

    you really should move the info about needing bootloader 5.08 from the bottom to the top (or at least before the steps). People need to know that before getting started… not after.

  • I moved it up a bit. Look 🙂

  • azlimy

    hi, the fuzzyband solution is only for iphone with bootloader 5.8. i had one but my bootloader is 5.9. could u help me how can i downgrade my basebane please…

  • nabil

    i have jailbroken my iphone 3g to fw 3.0, everything is working awesome, but i got problem with my wifi on iphone. i was try to restore and i did set up network setting…but still not working..i can not found it any network. please help me for my problems…thanks

  • hi after upgrading to 3.1.3 in iphone 3g i get “unable to load network list” have tried creating a new ipsw with “activate” unchecked in the pwnage too please help any inputs highly appreciated

    john

  • neFos

    my iPhone 3.1 Restored 🙁

    BootLoader 05.09
    BaseBand 05.11.07

    How to Unlock?
    Thanks

  • vu

    cant downgrade baseband 05.11.07 to 04.26.08 any help thanks

  • zu

    baseband 05.11.07
    bootloadder : 06.04
    Bb version : 05.11.07
    cant unlock and even sim is also not working? any help