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  • Downgrade 3G Baseband from 4.26 to 2.28. Important if you updated to 3.0!


    If you upgraded to 3.0 to try it out and then downgraded back to 2.2.1 and now find your baseband stuck at 4.26, there is now a solution. Thanks goes to w1kedZ for all the help and for cracking those ramdisks!

    This tool is based on the same exploit for the 5.08 bootloader, so you must have it. It will not work on 5.09 and so on. It will downgrade your baseband from 4.26 to 2.28! It is also very practical for you all that just upgraded to beta 4 to realize your sim adapter doesn't work with the newest baseband (4.26). We can downgrade your baseband to (4.22) so your sim adapter will function again.

    I know most of you are wondering if you can downgrade the baseband to 2.28 and run 3.0 at the same time for the purposes of using yellowsnow. The answer is yes you can run 3.0 and the 2.28 baseband together but you will have no phone and itunes will not be happy. 3.0 and 2.28 as of this moment can not talk to each other. If you want to run yellowsnow then you will have to return to 2.2.1. Sorry!

    YOU MUST BE ON BOOTLOADER 5.08! IF YOU ARE ON 5.09 THE TOOL WILL RUN BUT FAIL.

    Follow these instruction to find your bootloader.
    Provided by the phoenix (him121213)


    1. Install openssh and minicom from Cydia

    2. Create adhoc network between you iphone and mac. find the ip address from your iphone by hitting that little arrow.

    3. Open terminal from your mac

    4. Type ssh root@<ip> (replace"<ip>" with the address you found on the phone

    5. Type "yes" if it prompts you to allow connection

    6. Now type "alpine" for the password

    7. In terminal type "minicom -s". this will open a graphical utility to configure minicom. select "serial port setup" and hit return. press "a" and set serial device to "/dev/tty.debug" and hit return. now press "esc" ad in the main menu select "save setup as dfl" hit return, and now select "exit"

    8. Now hit ctrl+c and it should exit the minicom utility.

    9. Type "minicom -w" and hit return to launch minicom

    10. type "at+xgendata" hit return. you will see a cluster that says bootloader version: 5.? and if it says 5.08 you are okay to use any and all of the downgrade tools
    If you are on 5.08, then you are ready to move on to the BB downgrade

    To Downgrade your baseband from 4.26 to 2.28:

    1. Make sure you are running firmware 2.2.1 and jailbroken with OpenSSH installed.

    2. Launch Cydia or Icy and Install 3G Baseband Downgrade (BigBoss Repo)

    3. Download the BB Downgrade Patch: StealthBravoBBDowngrade

    4. Copy the fls and eep file from 4.26 folder in the Downloaded BB Patch into /Applications/3GBBD on the phone. Overwrite the current files

    5. On the phone run 3GBBD on the springboard and hit go

    6. This will take a minute or two

    7. When complete it should give you a green screen that says successful

    8. DO NOT CLICK GO AGAIN!

    9. Press the home button and then reboot your phone

    10. When your phone comes back, Goto settings -> general -> about and verify you are on 2.28

    You now can now run yellowsnow to unlock your phone again.
    IF YOUR SIM ADAPTER WORKED FINE ON ALL THE OTHER BETAS BUT DIED WHEN YOU UPGRADED TO BETA 4, THIS IS YOUR FIX!

    To Downgrade your baseband from 4.26 to 4.22:

    1. Make sure you are running firmware 3.0 and jailbroken with OpenSSH installed.

    2. Launch Icy and Install 3G Baseband Downgrade (BigBoss Repo)

    3. Download the BB Downgrade Patch: StealthBravoBBDowngrade

    4. Copy the BBUpdaterExtreme into /Applications/3GBBD on the phone. Overwrite the current file

    5. Check the permissions for BBUpdaterExtreme and make sure they are set to 777

    6. Copy the fls and eep file from 4.26 folder in the Downloaded BB Patch into /Applications/3GBBD on the phone. Overwrite the current files

    7. On the phone run 3GBBD on the springboard and hit go

    8. This will take a minute or two

    9. When complete it should give you a green screen that says successful

    10. DO NOT CLICK GO AGAIN!

    11. Press the home button and then reboot your phone

    12. When your phone comes back, Goto settings -> general -> about and verify you are on 2.28

    13. Copy the fls and eep file from 4.22 folder in the Downloaded BB Patch into /Applications/3GBBD on the phone. Overwrite the current files

    14. On the phone run 3GBBD on the springboard and hit go

    15. This will take a minute or two

    16. When complete it should give you a green screen that says successful

    17. DO NOT CLICK GO AGAIN!

    18. Press the home button and then reboot your phone

    19. When your phone comes back, Goto settings -> general -> about and verify you are on 4.22

    20. You can now insert your sim adapter into your phone and you should have service!
    If you have any problems, send me a PM. Enjoy!

    EDIT:

    Q: Will this work on 5.09?
    A: No, not at the moment. the reason that it will not work on any other boot loaders besides 5.08 is the exploit for this version has not been found yet. it is being investigated and worked on as we speak. please be patient.

    Q: Which baseband versions will this work for?
    A: this tool works on all versions between 2.30.03 and 4.26.04.
    This article was originally published in forum thread: Downgrade 3G Baseband from 4.26 to 2.28. Important if you updated to 3.0! started by StealthBravo View original post
    Comments 63 Comments
    1. burdell1's Avatar
      burdell1 -
      Any ideas on what might? It is driving me buggy trying to figure this out
    1. burdell1's Avatar
      burdell1 -
      Quote Originally Posted by StealthBravo View Post
      No it will not help

      are you sure? the more that I read about it, the more it seems to be a baseband issue....
    1. confucious's Avatar
      confucious -
      How do you plan on changing your BaseBand?