How to Downgrade iPhone 3GS Baseband

The downgrade iphone 3G is used to fix the problem after update of the GPS baseband iPad 06.15.00,
or to block the release of the operator of the iPhone 3G.

A good system if you backup by 4.1 SHSH is:
1.Download 4.1 stock firmware from apple.
2.Restore 4.1 directly using iTunes.
3.Backup 4.1 SHSH using TinyUmbella.
4.Make a custom firmware using PwnageTool_4.1.3.
5.Restore 4.1 custom firmware using iTunes.
6.”Exit Recovery” using TinyUmbella if need.


TinyUmbella 5.00.07…la-5.00.07.pkg

iPhone 4.1 stock firmware…7_Restore.ipsw

How to Downgrade iPhone 3GS Baseband 05.12.07 / 05.13.04 / 05.14.02 / 05.15.04 / 05.16.02 / 06.15.00

3 Responses to How to Downgrade iPhone 3GS Baseband

  1. nadhir says:

    I have an iphone 3GS which was running a jailbroken 4.1 with ipad 06.15.00 baseband ,why i updated the baseband ? because it was necessary to unlock carrier after jailbreaking , but this is not the problem ,Sbsettings did’t work properly on ios 4.1, so i wanted to downgrade to 3.1.3 with SHSH saved ,put device in pwned DFU mode ,ran tinyumbrella ,but i used a 3.1.3 stock firmware instead of a custom ,all went fine till itunes threw a 1015 error message, to bypass this, i tried IREB,irecovery,blackra1n,limera1,upgrading to latest firmware (4.3.5), Redsn0w, and every other possible way i can think of ;but i’m still stuck in recovery mode , this machine is so stubborn coz nothing seems to work on it .Please i’m addressing you experts of blackra1n community , if you have a solution let me know ASAP , i can’t imagine my life without iphone.

  2. Nicholas says:

    Will that method work with ipsw 4.3.3 ? I mistakenly updated my iphone to 4.3.5 and then i did a downgrade to 4.3.3.

    I want to know if that will work.

    thx in adv

  3. halim says:

    message for nadhir
    the ipsw 3.1.3 you alreaddy downloaded is no good probably
    try to download clean ipsw from other web site and will works 100%

Leave a Reply

Your email address will not be published.

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>