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iPhone Dev Team has already released UltraSn0w 1.2 to unlock iOS 4.2.1 on iPhone 3G, 3GS using Reds0w and Ultrasn0w.Here is the step by step guideline to unlock iOS 4.2.1 on iPhone 3G, 3GS.The iPhone Dev Team are currently unable to unlock baseband 05.14.02 on iPhone 3GS/3G but fortunately found a working exploit for baseband 06.15.00 (a higher version bb found on iPad 3.2.2). Which means that if you want to unlock any of the basebands from 05.14.02 and higher, then you have to first upgrade to baseband 06.15.00 and then unlock with Ultrasn0w 1.2.

If you haven’t done so, then go ahead and update your baseband to 06.15.00. Only then Ultrasn0w 1.2 will be able to unlock your iPhone.

Update iPhone 3GS, 3G baseband to 06.15.00 using PwnageTool 4.1.3

Update iPhone 3GS, 3G baseband to 06.15.00 using Redsn0w 0.9.6b5

After upgrading your baseband as mentioned above, continue with the following steps to unlock iPhone 3GS or 3G on basebands 04.26.08, 05.11.07, 05.21.01, 05.13.04 and 06.15.00. As you may have noticed baseband 05.14.02 is not included in this list because it is not unlockable by Ultrasn0w 1.2.

Step 1: Launch Cydia and go to the ‘Manage’ tab.

Step 2: Tap ‘Sources’.

Step 3: Tap ‘Edit’ at top right and then ‘Add’ at top left.

Step 4: Enter ‘http://repo666.ultrasn0w.com‘ and tap ‘Add Source’.

Step 5: After Cydia downloads the packages and completes updation of it’s sources, search for ‘Ultrasn0w’.

Step 6: Install Ultrasn0w 1.2.

Now restart your iPhone.you should be able to use any SIM (unofficial carrier also).
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Update iPhone 3GS/3G Baseband To 06.15.00 Using Redsn0w 0.9.6 Beta 5[How To Guide]

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  On November 29, 2010(4 years, 4 months ago.)

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22 Responses

  1. Aatif Says:

    Cydia is not updating my ultrasn0w to 1.2, i had ultrasn0w 1.1-1 in my 3gs 4.1 with 5.14.02, when i m trying to add repo666.ultrasn0w.com. It is again showing the older version of ultrasn0w. please help

    Posted on November 29th, 2010 at 7:23 AM

  2. Aatif Says:

    Cydia is not updating my ultrasn0w to 1.2, i had ultrasn0w 1.1-1 in my 3gs 4.1 with 5.14.02, when i m trying to add repo666.ultrasn0w.com. It is again showing the older version of ultrasn0w. please help

    Posted on November 29th, 2010 at 7:27 AM

  3. Jessie Says:

    Works great! Thanks Dev Team and tech journal

    Posted on November 29th, 2010 at 1:26 PM

  4. Abuzer Kadu Says:

    worked like a charm! thanks! i was on ios 4.1 iphone 3g with bb 05.14.02 and everything went as explained.
    thanks a lot! :-)

    Posted on November 30th, 2010 at 4:21 PM

  5. How To Activate iPhone 3GS, 3G After Ultrasn0w 1.2 To Fix Battery Drain Using Redsn0w 0.9.6b6 | TheTechJournal.com Says:

    […] on Twitter.Those iPhone 3GS and 3G users who are facing battery drain problems after unlocking with ultrasn0w 1.2 for them a new cydia tweak has released to activate iPhone 3GS, 3G without stock SIM.After doing […]

    Posted on December 3rd, 2010 at 2:33 PM

  6. Raazdan Says:

    i unlocked my 3GS with 4.2.1 but i am not getting any signal..any ideas???

    Posted on January 18th, 2011 at 9:43 AM

  7. Sekhri_amit Says:

    Have upgrading I have been facing a contant problme with the coonectivity. Have problems such as Call Drop, Voice Breaking ans Constant Static. Are there any tools to fix these problems??

    Posted on February 5th, 2011 at 4:46 PM

  8. Adi Says:

    in cydia go to SOURCES.
    add http://heaveniphone.com/cydia as source…
    now look for Ultrasn0w BB 06.15.00 and download.

    –> this should work

    Posted on February 7th, 2011 at 7:07 PM

  9. Asif Gaddi Says:

    iPhone 3GS 4.2.1 06.15 not catching carrier… Says searching and doesn’t come up with any options for tmobile… Ultrasn0w is downloaded , followed steph by step but isn’t catching a carrier….help !!!!

    Posted on February 8th, 2011 at 3:32 AM

  10. SEKHRI_Amit Says:

    This does not help

    Posted on February 8th, 2011 at 4:36 AM

  11. SEKHRI_Amit Says:

    This does not help

    Posted on February 8th, 2011 at 4:36 AM

  12. Meshal Says:

    Have the same problem

    Posted on February 15th, 2011 at 10:39 PM

  13. Meshal Says:

    I also did the same but nothing happened.

    Posted on February 15th, 2011 at 10:42 PM

  14. Philliphumphery Says:

    My service cuts n and out… Need help

    Posted on March 15th, 2011 at 11:37 PM

  15. Philliphumphery Says:

    My service cuts n and out… Need help

    Posted on March 15th, 2011 at 11:37 PM

  16. Nssharar Says:

     Ultrasn0w on cydia only has an option for 1.2.3 and it is not working with my iphone 3g, it says no sim!

    Posted on May 20th, 2011 at 7:01 PM

  17. Ogerwolf15 Says:

    because you jailbroke your iphone with redsnow bumbass 

    Posted on May 23rd, 2011 at 3:33 AM

  18. Joe_blo123 Says:

    does not work

    Posted on June 23rd, 2011 at 1:39 PM

  19. Daddy-Cruel Says:

    Thank’s my friends, Finally i’m bac on track, i’ve had bad problems after doing a upgrade to 4.2.1 but this solved the problems i’ve got. God Bless You All !!!  Lasse at Mallorca, Spain

    Posted on September 26th, 2011 at 5:28 PM

  20. Xiu Says:

    Same here!

    Posted on December 28th, 2011 at 9:20 PM

  21. Veergoudarrohan Says:

    Hey guys just realse a software to unlock I phone 3G with os 4.2.1 n base band 5.15.04

    Posted on February 5th, 2012 at 12:18 AM

  22. Darryl Says:

    Did you ever find a fix for that?  I have the same problem.. iphone 3g, 4.1 IOs 06.15.00 firmware, unlocked with ultrasn0w.  I tried resetting all settings, resetting network settings, taking out sim turing off 3g, all those solutions.  sometimes it’ll be fine for the day.. but most days I loose the signal and have to go to airplane mode then back to get the signal back.. btw it goes to NO SIM too.. same way to get it back.. bad thing is that I’m missing calls and stuff cuz of this.. 

    Posted on February 23rd, 2012 at 8:45 PM

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