How to Downgrade iPhone 3G Baseband 5.15.04 with Fuzzyband 4.1

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Update: We have received unconfirmed reports that Fuzzyband 4.1 does not support baseband 5.15.04. Fuzzyband creator tweeted 6 days ago that there will be an updated version of Fuzzyband which may downgrade baseband 5.15.04.

“fuzzy will be updated as soon as gm is released to public”

Did you upgrade to iOS 4.2.1 and found out that your baseband is now on version 5.15.04? Currently, there is no software unlock available, at least for another few days. The unlock for baseband 5.14.02 is definitely coming, but it is not clear for baseband 5.15.04.

Editor's note: learn more by reading our ebook on starting your own iPhone repair & unlock business

Fuzzyband version 4.1 is out on Cydia. It will downgrade baseband version 5.15.04 to 5.13.04 for Ultrasn0w.

However, this only works for iPhone 3G with bootloader version 5.08. Other iPhone models will not work using this method.

How to downgrade your baseband from 5.15.04 to 5.13.04:

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 and 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 05.15.02. 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!” similar to the one shown above.

Did this work for you? Leave your comments below.

How to Downgrade iPhone 3G Baseband 5.15.04 with Fuzzyband 4.1 was last modified: June 19th, 2018 by Joe Wang

Comments & Discussion

  1. I have a 3G iphone with 3.1.2 version, 05.11.07 baseband. jailbroken/unlocked with brackrain. I can make calls but my GPS cannot locate position. I tried to use fuzzyband 4.1 to downgrade the baseband but fuzzyband only shows upgrade. what am I missing. please help

  2. I am getting the message under Bootloader Version "(null)[(null)] , Baseband version is Empty And the iphone OS version is 4.0 It says underneath it all that the Baseband not supported yet. What the heck???? Can you please help

  3. Your instructions didn’t work at all for me. It turns out redsn0w doesn’t work correctly with iTunes 10.6. Neither does f0rcast. Tiny Umbrella works, but did not show my bootloader version. I finally went with the following instead:

    1. Restore to 4.2.1

    2. Download redsn0w 0.9.6rc19 and the 4.2.1 ipsw file.

    2. Run redsn0w 0.96rc19.

    3. Select the IPSW for 4.2.1 I had already downloaded.

    4. Install cynthia to jailbreak.

    5. Use cynthia to install fuzzyband.

    6. Run fuzzyband.

    At that point I stopped, as fuzzyband reported I have bootloader 05.09.

    So since I couldn’t downgrade, preceeded with the upgrade.

    7. Download redsn0w 0.99.10b6.

    8. Download itunesMobileDevice.dll

    9. Copy itunesMobileDevice.dll to the redsn0w 0.9.10b6 directory.

    10. Rename itunesMobileDevice.dll to MobileDevice.dll.

    11. Run redsn0w 0.99.10b6

    12. Select the ipsw file.

    13. Jailbreak. Uncheck the install Cynthia and battery checkboxes. And check the ipad baseband checkbox.

    14. Once jailbroken install ultrasn0w with cynthia and reboot.

    Of course the problem with upgrading is it is one way only, and for some people the GPS doesn’t work afterwards. For me the GPS is working fine, but I notice there are no longer any location services settings. So my guess is if you upgrade with your GPS turned off, it will remain off forever. If you upgrade with your GPS turned on, and you are lucky it will remain on forever.

    For those trying different versions of redsn0w here is what I found with iTunes 10.6 instealled. 0.99.10b6 will give an an allocate (233) error if you try to install cynthia. The earlier versions of 0.99.10b* will not recognize the iPhone as connected in DSU mode. Consequently this is why I ended up using 0.96rc19 for the initial breaking.

    As I commented above f0rcast is broken and tiny umbella are useless. However, even if they worked it seems like a redundant extra step since fuzzyband will report the bootloader version.

  4. Oh the comments about tiny umbrella and f0rcast were relevant to a different blog. This one started off assuming the iphone was already jailbroken…

  5. wow it works tnx i downgraded my iphone 3g 5.15.04 to 5.13.04… now i enjoy using my iphone tnx gudluck to every body

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