Downgrade iPhone OS 3.1.3 Baseband 05.12.01 to 3.1.2 Using Fuzzyband

By Sandip Dedhia on February 10, 2010
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Jailbreak iPhone 2G
We have covered PwnageTool 3.1.5 to Jailbreak iPhone 3.1.3 & Redsn0w 0.9.4 to Jailbreak iPhone 2G 3.1.3 you can also unlock iPhone OS 3.1.3 with Ultrasn0w. Now incase if you upgraded to firmware 3.1.3 mistakenly and looking for way to downgrade to OS 3.1.2 then here is Fuzzyband Downgrader iPhone app.

Fuzzyband Downgrader has been updated to support downgrading from iPhone OS 3.1.3 baseband (05.12.01) for 05.08 bootloader users (early iPhone 3G). You can find Fuzzyband in the System section of Cydia.
Using this utility early iPhone 3G users can downgrade their baseband to an unlockable version allowing them run OS 3.1.3 unlocked even if they accidentally upgraded. Follow below steps to downgrade iPhone OS 3.1.3 to 3.1.2 using Fuzzyband.

How to Downgrade iPhone OS 3.1.3 (Baseband 05.12.01) to 3.1.2 Using Fuzzyband

1. Launch Cydia from your springboard, and go to systems under section tab

2. Press to select 3G Fuzzyband Downgrader from the list of packages & click on install.

3. After installation is completed successfully return to cydia and press home button and launch Fuzzyband.

4. A message will be displayed if your bootloader is not supported,  If you have the 5.08 bootloader you will be able to downgrade from baseband 05.12.01. Press the Downgrade button to begin downgrading your baseband.

5. Once the downgrade has completed successfully you will be displayed a Done! message saying, “I Haz Downgrade!”

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Sandip Dedhia

Sandip Dedhia

Sandip Dedhia is the founder of Blogsdna.com, he loves to write on technology, gadgets & web services. At Blogsdna you can read his Windows & freeware software related articles. He is on twitter too @sandipnd View author profile

  • Juan

    What if I dont have Cydia and cant install it? remember the phone is locked…

  • edwin

    I have a 3g on 3.1.3 baseband 05.12.01.
    It is carrier unlocked and not unjailbroken. If I jailbreak it, will it be locked?

  • edwin

    I mean it is not jailbroken.

  • Alex

    If you have a 3gs phone, unfortunately there is still nothing you can do at this time.
    If you have a 3G iphone you will have to jailbreak your phone once again using the RedSnow Loophole. This will also install Cydia on your iphone.
    The best link with instructions and download information for jailbreaking with redsnow can be found here: http://www.youtube.com/watch?v=rklxwqpKAVs

  • Betti

    Fuzzyband doesn’t work with the 05.12.01 … Only with 05.08 …
    What a deception…

  • mitch

    I’m one of those guys who pressed OK for the iTunes updates. Well I didn’t even know that I would have to unlock my phone before today.

    Anyways, I tried this with my 3G 3.1.3. The jailbreaking went fine as indicated by Alex. But then when running Fuzzyband it fails to downgrade. I get the following:

    Fuzzyband Downgrader 1.0
    Bootloader Version 0.00
    Baseband Version 0.00
    iPhone OS Version 3.1.3
    Not Supported

    From Cydia, I thought this was supposed to be Fuzzyband 2.0 …

    Also why is it unable to find the bootloader and baseband versions ?

    Thanks,
    Mitch

  • almighty

    hey edwin how did you unlock your iphone 3g on the 3.1.3 firmware with a 05.12.01. pleaaaaaassssseeeeee help me asap please and thanks in advance.

  • edwin

    sorry, mine is sold unlocked by carrier.
    If it is jailbreaked, afraid it will be locked.

  • zankuu

    Look guys i have been looking trough the whole internet looking for a way to down grade from 3.1.3 to 3.1.2 witch will then enable you to jailbreak the iphone 3gs pls pls pls do not upgrade to the 3.1.3 as it has no known jailbreak and website offering it are talking bull geohot will make one just wait untill then there is no way iphone can be downgraded even tho it says it can and you can download the 3.1.2 and shift click restore it wont work itune will not sign it and it wont work so there is no safe way to do it unles u have the things saved to cilla but that is it so dony upgrade and if ya have dont bother wasting time looking for a way round there is no way if you have and you want to be the first to know about it serch nightzankuu on youtube subscribe to me and as soon as my team find one make one i wil post a video for the site and a direct link to the download and a step by step on how to do it

  • Pingback: How to downgrade iPhone 3.1.3 OS 05.12.01 baseband with fuzzband | TuCknoloji

  • Luciano Bicalho

    Forgive my ignorance I am beginner in this matter. I just win an iphone 3G 16gb that came from the U.S., dizzy here inadvertently updated it in iTunes and now it is running Firmware 3.1.3 Original and the Baseband 05.12.01. I installed cydia and tried Fuzzyband by downgrading the baseband, only that my bootloader 05.09, all I’m reading on the Internet tells me that there’s no way to unlock the beast for now. The Question is: If it would be possible to restore the iPhone to factory or something. Again I apologize for my ignorance on the subject. Please would like some help. Thank you!

  • JDunn

    So do u thinks its possible to jailbreak the newest base-band cause i did the same thing on my 3Gs n whats the point of an iphone if u cant jailbreak it right

  • patric

    i have the same problem. isnt there a way to downgrade the bootloader?

  • Cianuro

    How could I access fuzzyband on the 3gs 3.1.3 if there’s no jailbreak even to get cydia?

  • deepak

    how to unlock iphone 3g 3.1.3, basband 5.12.7, bootloder 5.09

  • http://rahulvaja.blogspot.com rahul

    Please help me out..
    I have by mistake updated to IPHONE 3g OS 3.1.3….
    Anyhow after so many efforts i am able bring it back to OS 3.0..
    Cydia is also there..Now My Modem Firmware is 05.12.01
    and signal –No service– and network selection shows only –Automatic–
    even i am not able to Downgrade Baseband 05.12.01 to any other..
    is there any way,,like again format Iphone and do any possible idea..
    Help me.. otherwise my iphone is Gone…..save it

  • Liam

    There is a way to restore old firmware even with apple no longer singing it. Read on…

    iTunes basically sends a hash of your firmware file to the apple server, then apple server checks and see if they are still signing for that hash. If so, they send back a response saying “Go ahead, install it!”. To beat this technique to install old firmware,a simple man in the middle attack is called for, you intercept the request and send itunes the appropriate response.

    Link to guide on how to (should work with ipod touch all gens): http://modmyi.com/forums/3g-s-downgrading/685331-howto-setup-local-3gs-restore-verification-server-ecid-shsh.html

  • Luke

    Guys, I think you’re getting a bit confused here and being a bit hasty to call out the poster.

    1. All firmware can be jailbroken, including 3.1.3
    2. NOT all basebands can be unlocked (5.12.01 is not unlockable)
    3. Fuzzyband will only work if you have BOOTLOADER 5.08 (different to baseband)

    If you have the 5.08 bootloader then it is always possible to downgrade, since you can downgrade the baseband which will then enable you to downgrade the firmware through shift+restore in iTunes.

    If you have a bootloader any higher than 5.08 then you are unable to downgrade/unlock. You will have to wait until the release of 4.0 and then you should be fine.

  • Danjam

    Well my bootloader is 6.2 so i don’t think I’ll make progress anytime soon lol

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