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Downgrade iPhone Baseband 04.12.01 to 04.11.08 [How To Guide]

iPhone Unlock 14.03.2012
Factory AT&T iPhone Unlock

This guide is for those people who accidentally updated their iPhone 4 to iOS 5.1 and lost their unlocks via Gevey SIM unlock solution. There is good and bad news. There’s no iPhone 4 unlock for 04.12.01 baseband but there’s a way out. iOS 4.3.5 the last of iOS 4-x series, is still supported by Apple. That means that you can downgrade to 04.10.01 which can be easily unlocked by Gevey SIM.

Notice: before you start the downgrading process make sure that you have your SHSH blobs saved locally or on Saurik’s Cydia servers.

Now it’s time to perform baseband downgrade 04.12.01 to 04.11.08, 04.10.01, 01.59.00 on your iPhone.

Downgrade Step 1: Frist of all, you need a restore copy of iOS 4.3.5 which you can download here.

Downgrade Step 2: Make sure that your hosts file redirects Apple’s requests to Saurik’s server. Or you can use TinyUmbrella to make iTunes send requests to Cydia’s server by going to the Advanced options.

Downgrade Step 3: Now Turn OFF your device and plug it in to the computer.

Downgrade Step 4: Put your device into DFU mode: Press power button for 2 seconds. Hold down both the Power and Home buttons together for 10 seconds. Release the Power button but keep holding the Home button for 10 more seconds. If your screen is black, you’re in DFU mode. If an iTunes logo is displayed, you’re in Restore Mode: just try the steps above a few more times, sometimes it doesn’t go well on the first try.

Downgrade Step 5: Now manually select firmware from iTunes in restore window. For doing that press Shift and Restore on Windows and Option + Restore on Mac.

Now iTunes will send data to Saurik’s servers instead of Apple’s. Haha.

With help of this tutorial you should successfully downgrade from iOS 5.1 to iOS 4.3.5 and downgrade iPhone 4 baseband 04.12.01 to 04.11.08, 04.10.01 and 01.59.00. Now you’re able to use Gevey SIM unlock again. If you want to use iOS 5 on your iPhone and keep Gevey SIM unlock check our Unlock iPhone 4 using Gevey Sim on iOS 5 guide.

« How to Unlock iPhone 4 on iOS 5.0.1 [Guide] Unlock Baseband 04.12.01 Method »
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Комментариев: 16 to “Downgrade iPhone Baseband 04.12.01 to 04.11.08 [How To Guide]”

  1. saury says:
    March 20, 2012 at 02:23

    quem publicou esse merda

    Reply
  2. Unlock my iPhone says:
    March 23, 2012 at 16:33

    Could you explain a little bit more the step number 2?

    Reply
    • @iPhotoN says:
      July 29, 2012 at 16:37

      http://www.saurik.com/id/12/

      Bypassing the Overlord
      To this end, I have constructed a server that duplicates the functionality exposed by Apple's signature server, except using "on file" results rather than live requests.
      All we need, then, is to make iTunes use it. Luckily, most operating systems also have the ability to locally define bypasses on specific hostnames through a file called hosts. Using this, we can redirect requests to Apple's signature server to Cydia.
      So, open the file C:WindowsSystem32driversetchosts (Windows) or /etc/hosts (Mac OS X) and add the following entry to the bottom of the file.
      74.208.10.249 gs.apple.com
      Now, when iTunes thinks it is talking to Apple, it is talking to Cydia instead. Doing this will allow iTunes to access signatures already stored by Cydia's "on file" feature.
      This server will also act as a cache for any SHSH blobs it hasn't seen, acting as an intermediary to Apple's server. This effectively registers your device with the "on file" mechanism, which means you can now enjoy the protections of being able to downgrade your firmware in the future even if you aren't jailbroken.

      Reply
  3. Aziz says:
    March 25, 2012 at 17:55

    bb 04.12.01 is not changed after downgrade to ios 4.3.5 iphone4

    Reply
  4. chaouki says:
    April 4, 2012 at 11:33

    erreur 2005

    Reply
  5. oops says:
    April 8, 2012 at 12:51

    That's strange, Cydia says I have SHSH 4.3.5 and 5.0.1, but I still get an error. Any idea (s)?

    Reply
  6. Toyoko says:
    May 21, 2012 at 13:24

    i just bought my iohnpe couple of days ago. its 3gs version 3.1.3 (7E18), modem firmware 05.12.01 . can i jail break my iohnpe using your method?please advise.and it its possible, will the iohnpe be lock if the battery flat?

    Reply
  7. sandip says:
    June 21, 2012 at 09:03

    not wrking

    Reply
  8. @iPhotoN says:
    July 29, 2012 at 16:38

    i've got an error message: http://cl.ly/image/3x1V0i0j2t02
    Are there any idias how to realize stap 5?

    Reply
  9. yourworstnightmare says:
    August 14, 2012 at 05:27

    ONLY THE FIRMWARE WOULD BE DOWNGRADED!!!!
    THE BASEBAND WILL NOT CHANGE!!!!
    GIANT NOOOOOOOOOOOOOOOOOBS!!!!
    THIS IS A FAKE GUIDE!!!!

    Reply
  10. yourworstnightmare says:
    August 15, 2012 at 17:04

    But there is one possible method to downgrade the baseband!
    1. It's only works on 3g and 3gs
    2. Only the next type of 3gs's could be downgraded (16gb,32gb which has been pruduced 2011 34th week before 8gb Wich has been produced 2011 28th week before)
    3. Whit ipad baseband!

    Reply
  11. tom says:
    October 9, 2012 at 13:21

    Doesn't work….

    Reply
  12. Sr33 says:
    March 5, 2013 at 05:32

    This is all bullshit. Dont waste your time folks.

    Reply
  13. michael says:
    April 26, 2013 at 03:39

    now a days apple phone are not good when u buy is not possible to use any Sim .. but when u buy other phones u can use any Sim u want am fed-up using apple. they hv to make their phone that any Sim can be use with , i hv wast my time for buying phone

    Reply

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