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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. Napoleon_PhoneApart's Avatar
      Napoleon_PhoneApart -
      Quote Originally Posted by alfuhrer View Post
      hi guys

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

      THANK U
      That was already explained in the first post of this thread.
    1. KoolMan0's Avatar
      KoolMan0 -
      Quote Originally Posted by xlnzee View Post
      now with the new Beta arriving, Will this work with the OS 3.0 Beta 5 with BB 4.26.08?
      this will only work on 5.08 BL
    1. confucious's Avatar
      confucious -
      Quote Originally Posted by FireFish View Post
      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.
      Downgrading from FW3.0 b5 to 2.21 has been detailed in many threads and can be done. Once you have downgraded to 2.21 you will still have the 4.2x baseband that came with FW3.0

      This thread is all about downgrading the BB as YellowSn0w can not be used with any BB other than 2.28.00
    1. zani1972's Avatar
      zani1972 -
      hi i realy have a problem i was deleting some things on iphone battery died so i pluged it in again to charge it went into recovery mode i couldnt get it out so i restored on a mac option+restore but one thing i think i did wrong i used the 2.2.1 but used 5H11 i had 5G77 but another thing it was unlocked with yellowsnow mine was a 5.09 and it is still a 5.09 please help is there any way to fix this problem thankyou
    1. shararti_125's Avatar
      shararti_125 -
      I was accidently update with the OS3.0 Beta 5 and cause of this my modem firmware update with 04.26.08. I purchased my phone from Ireland and currently I'm in Australia using Optus network.. But my phone was locked after updating. Please solve this issue. My bootlader is 5.09

      [email protected]
    1. confucious's Avatar
      confucious -
      Accidently upgraded?
      If you were stupid enough to upgrade without Reading up first I'm sure will have read up enough by now to know that you are well and truly stuffed until FW3.0 is officialy released then unlocked.
    1. 6orly9's Avatar
      6orly9 -
      hello to anyone,anybody know where can i download BL 5.08?
    1. StealthBravo's Avatar
      StealthBravo -
      ^You cant. Either you have it or you dont
    1. 6orly9's Avatar
      6orly9 -
      what do u mean stealthbravo?
    1. confucious's Avatar
      confucious -
      You really haven't read a lot have you?
      The bootloader on your phone can not be changed without reprogramming your NOR chip and AFAIK there are only two places you can get that done, one in Vietnam and one in India.
      It is not something you can download or change yourself.
    1. 6orly9's Avatar
      6orly9 -
      @confucious
      im sorry coz i cant get it bcoz when i upgrade my iphone 2g there is BL that i put on the qwkpwn.
    1. confucious's Avatar
      confucious -
      Are you talking 2G or 3G - it is completely different on the 3G
    1. 6orly9's Avatar
      6orly9 -
      no i just confaring the system to download,now im trying to use qwkpwn to my iphone 3g but my qwkpwn was asking for v2_2.2.2 ipsw but i have only ipsw v1_2.2.2 and its not compatible to my qwkpwn,can u help me pls where can i download that kind of ipsw,anybody plssssssssssss.@ confucious and stealthbravo i know u are expert here
    1. confucious's Avatar
      confucious -
      Tutorials and files for the 3G can be found here
    1. 6orly9's Avatar
      6orly9 -
      @confucious

      theres any software that u can put cydia in iphone?i mean my iphone 3g dont have cydia and where can i get it even installer dont have

      @confucious

      theres any software that u can put cydia in iphone?i mean my iphone 3g dont have cydia and where can i get it even installer dont have

      @confucious

      theres any software that u can put cydia in iphone?i mean my iphone 3g dont have cydia and where can i get it even installer dont have
    1. confucious's Avatar
      confucious -
      When you jailbreak it gives you the option to install cydia and / or installer - I would not bother with installer.
      Just follow the tutorial in my previous post.
    1. 6orly9's Avatar
      6orly9 -
      @confucious
      tnx for that info.so t means no chance to install icon directly to iphone?by the way is there ym in cydia?
    1. dara77's Avatar
      dara77 -
      brother stealthbravo.
      how can i copy the files that give online to the iphone.
      any structure.

      i really dont know. please let me know.
      thank
    1. burdell1's Avatar
      burdell1 -
      This might be a dumb question, but will this help with the wifi problems a lot of people are having with 3.0? i think the problem is a combination of the baseband and the ultrasn0w
    1. StealthBravo's Avatar
      StealthBravo -
      No it will not help