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Unlock iPhone 4 04.12.01 iOS 5.1.1


To began reading this post first you need to know that all methods which are given here have two problems. First not all of tham are free. Even those which are free can’t be used on some baseband as 04.12.01 on iPhone 4 running iOS 5.1.1. For that model there is the paid method. But, as for me, this paid method is too expensive, so I have something for you – cheap and legit at the same time. You can try iPhone IMEI unlocking service that can be used on all iPhone baseband, iOS and networks.

8/16/2012 – Update: Dear users, its seam for now there is only IMEI unlock solution for those who stacked on 04.11.08 – 04.12.01 basebands. The only problem there are no free IMEI services on the web, but we cached out DigitalUnlocking.com website who seems to have the cheapest prices starting from $6 depends on the carrier your device was locked to.

Since we are available to jailbreak the latest iOS with Absinthe 2.x it’s time to think on how to unlock baseband iPhone 4 04.12.01 iOS 5.1.1 or iPhone 3GS as well. If you have already jailbroken your device or plan to do it in the nearest future – read on and find out which are those unlocking solutions.

Also if your iPhone 4 is on 04.11.08/04.12.01 you can use this link to see others way to unlock it. May be there you will find your way.

First of all, there are three methods for you to unlock your iPhone 4 or iPhone 3GS on latest firmware. They all depend on your baseband versions. The first one is Ultarsn0w fixer 5.1.1.


How to unlock iPhone 4/3GS iOS 5.1.1 with Ultarsn0w fixer 5.1.1:

Note: ONLY following basebands can be unlocked using this tool:

  • iPhone 4 — Baseband 01.59.00
  • iPhone 3GS — Baseband 04.26.08
  • iPhone 3GS — Baseband 05.11.07
  • iPhone 3GS — Baseband 05.12.01
  • iPhone 3GS — Baseband 05.13.04
  • iPhone 3GS — Baseband 06.15.00

Step One: Jailbreak untethered with Absinthe or Sn0wbreeze.

Step Two: Run Cydia, go to Manage->Sources

Step Three: Add this repo:


Step Four: Go to Search and type in ultrasn0w 1.2.5 and tap Install.

Step Five: Search for Ultarsn0w fixer 5.1.1. Install it.

That’s it, you have successfully unlocked your iPhone 4/iPhone 3GS on Ultarsn0w fixer 5.1.1 supported baseband and iOS 5.1.1.

The second way for you to unlock iPhone 4 4.12.01 (as well) is to use your saved SAM ticket. This method works for all devices including unlocking iPhone 4 04.12.01 iOS 5.1.1 as long as you have your activation ticket saved.

Unlock iPhone 4 with SAM 5.1.1:

Step One: Jailbreak untethered with Absinthe or Sn0wbreeze.

Step Two: Run Cydia and install the latest version of SAM (0.1.15-1)

Step Three: Launch the app, go to Utilities and tap ‘Revert Lockdownd to Stock’. That will put your Lockdown folder (where the activation ticket is saved) is status quo position.

Note: My iPhone 4 caught network right after I did that. If your didn’t – please proceed.

Step Four: Put the previously saved activation Lockdown folder back to /var/root/Library/Lockdown

Step Five: Reboot your phone.

Step Six: Now you can delete SAM if you want to.

And finally the last method that can unlock your iPhone iOS 5.1.1 almost on any baseband.

Unlock iPhone 4 iOS 5.1.1 with Gevey SIM:

We have plenty of tutorials on how to unlock your iPhone 4/4S with Gevey SIM. Nothing has changed with iOS 5.1.1 release and all those cards work perfectly with the new Apple’s firmware. Check this link to find a solution for you.

As you can see there’s a way to unlock iPhone 4 04.12.01 iOS 5.1.1, but if you were lucky and fast enough to perform your SAM unlock during the week he worked. As soon as you have your ticket saved and stick to the only SIM card – you’re out of danger.

Please let us know how those methods worked for you in the comments under the post or on social networks.

  1. neponil June 1, 2012 at 09:54

    Too bad I don't have SAM ticket. Well i guess i have to wait …

  2. soren June 2, 2012 at 11:23

    No of your solutions works

    • Mark June 5, 2012 at 16:32

      Are you sure you have your SAM ticket saved and restored correctly? If you did, then try the 'Revert to lockdown' option within SAM options and then put the previously saved activation Lockdown folder back to /var/root/Library/Lockdown again and reboot.

  3. Marko August 4, 2012 at 17:16


    I have the sam unlocked Iphone 4 but how I can unlock it with other SIM card?

  4. hieule August 20, 2012 at 17:48

    i have iphone 4 white at&t ios 5.1.1 baseband 4.12.01 how can unlock show me which way is work today thanks so much : use sam or ultrasnow or redsnowor officer or factory ulock pleae lets me know asp

  5. kareem September 15, 2012 at 13:17

    imei 012420001156161 and i want to know to which carrier it locked please

  6. riskmore September 23, 2012 at 10:07

    My iPhone 3gs with early serial number and late ROM was unlocked, jailbroken and working fine until it updated to io6 by itunes which resulted in an error that I forgot but the phone was searching for a network and failed to activate by itunes or wi-fi.
    Currently the installed firmware version is: 6.0gm
    and the baseband version is: 06.15.00-6.4_M3S2

    itunes error recommended I revert to the the backup which I tried and now I have an itunes error : there is no SIM card in the installed in the ipone you are attempting to activate.

    there is no SHSH backup

    following instructions to downgrade form 6.15 to 5.15 with redsn)w o9,0.1b2 I selected the current iPhone2,1_6.0_10A403_Restore.ipsw from my Mac iTunes files but redsnOw does not support it.

    I had downloaded a number of different 5.1 ipsw files to downgrade to with the intent of unlocking but can’t get that far.

    Apsinthe did not support the attached device.

    Is my io6 baseband different than the 6.15 Ipad file?

    Am I using redsn0w correctly by targeting the currently installed 6.15 file?

    Can I downgrade to 4.0 then up to the iPad 6.15 then down to an unlock able 5.1?

    Is this phone now junk?

  7. zill March 4, 2013 at 17:44

    please guide i didnot know how put previously lokdown folder back. where is /var/root/Library/Lockdown ????thnks