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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. StealthBravo's Avatar
      StealthBravo -
      It will leave your bootloader at 6.02 and upgrade your baseband to 4.26. Don't do it if you need yellowsnow
    1. matinm90's Avatar
      matinm90 -
      lol so apparently i have 6.4 bootloader
    1. JStraitiff's Avatar
      JStraitiff -
      READ THIS!!!


      this is a clarification to the original thread... if you ask any of these following questions they will not be answered because that are answered here.

      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 5.8 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 will be added to probably as people ask dumb questions
    1. StealthBravo's Avatar
      StealthBravo -
      Quote Originally Posted by him121213 View Post
      this is a clarification to the original thread... if you ask any of these following questions they will not be answered because that are answered here.

      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 5.8 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 will be added to probably as people ask dumb questions
      Thanks! I will add to main post
    1. psp2468's Avatar
      psp2468 -
      If you guys want a Megaupload free download of StealthBravoBBDowngrade, here ya go: http://blog.alltechrelated.com/files...4.26to2.28.zip
    1. KoolMan0's Avatar
      KoolMan0 -
      Sweet!!

      too bad I just picked up a new iphone and its 5.9 i think since the BB downgrade did not work
      i will have to check and see later if the iphone is 5.8
      thanks and keep up the good work.
    1. xlnzee's Avatar
      xlnzee -
      now with the new Beta arriving, Will this work with the OS 3.0 Beta 5 with BB 4.26.08?
    1. n00neimp0rtant's Avatar
      n00neimp0rtant -
      So my phone rebooted why trying to do this, and now it's being a real d!ck about getting service again (with my RebelSIM).
    1. johnd's Avatar
      johnd -
      thanks alot SteathBravo for your downgrade tools my is 5.8BL
    1. Jonatan Torres's Avatar
      Jonatan Torres -
      I Have a jailbroken iphone 3g manufacured before the specified date (therefor with bootloader 5.08) running a jailbroken 2.2.1 firmware and i have done all the rewriting of the .eep and .fls files and still when i run the down grader on my iphone it says that i failed. What am i doing wrong?

      ???
    1. iluvmine's Avatar
      iluvmine -
      So are mac users that upgraded stuck on 3.0. Im about to scream, I can not stand 3.0 and I need 2.2.1 back, please some one help a MAC user that has no access to a PC!!
    1. StealthBravo's Avatar
      StealthBravo -
      ^You can downgrade on a mac. What problem are you having?
    1. confucious's Avatar
      confucious -
      Quote Originally Posted by Jonatan Torres View Post
      I Have a jailbroken iphone 3g manufacured before the specified date (therefor with bootloader 5.08) running a jailbroken 2.2.1 firmware and i have done all the rewriting of the .eep and .fls files and still when i run the down grader on my iphone it says that i failed. What am i doing wrong?

      ???
      Have you actually checked your BL or are you just assuming it's 5.08?
    1. ButcherJF's Avatar
      ButcherJF -
      I'm sorry, but I can't find the 3G Baseband Downgrader in Icy. Rebooted mij iPhone, refreshed the sources, but still cannot find it.
      Can it be that it's renewed/renamed to '3G Fuzzyband Downgrader'? I installed this one, and this doesn't work on 3.0.
    1. StealthBravo's Avatar
      StealthBravo -
      Use this one:
      http://www.modmyi.com/forums/iphone-...ck-button.html

      Just downgrade to 2.2.1 firmware first
    1. ButcherJF's Avatar
      ButcherJF -
      Thnx, I'm on my way already. Fingers crossed!

      EDIT: Works fine, after this I ran Yellowsn0w and my iPhone is unlocked again.
    1. madlight88's Avatar
      madlight88 -
      hey folks,some one PLEASE help me with this:
      i have my 3g upgraded to 2.2.1 via a firmware file downloaded from this website,and i used quickpawn2.2.5 to fix it.but there's no antenna! someone told me u have no way but buying X-simcards something attached to the SIM and the antenna works(of course he explained some probable issues about it) some one plz help me with this,its really disgusting.
      ps: i dont know the difference between unlock and jailbreak!
    1. confucious's Avatar
      confucious -
      Jailbraking just allows you to install applications that aren't in the app store.
      To use with a non approved SIM you need to unlock.
      If you hadn't updated to 2.21 you could have unlocked with YellowSn0w but as you have you will need a 'piggyback SIM'
      You haven't said what country you are in or what network you are wanting to use your phone on so we can't help much more...
    1. FireFish's Avatar
      FireFish -
      Will this downgrade the latest iPhone 3G running v3.0 on BETA 5 back to 2.2.1? What practical IPSW firmware file versions are needed here; the versions you mentioned are baseband versions.

      I'm only asking because I know someone knows. Otherwise, I'd spend the 5 minutes in researching it.
    1. alfuhrer's Avatar
      alfuhrer -
      hi guys

      my iphone have bootloader 5.9 i can't downgrade to 2.28

      THANK U