Jailbreak your iPhone

Dev Team releases Ultrasn0w 1.2 Unlock for iOS 4.2.1


iPhone Dev team just released Ultrasn0w 1.2 unlock for iPhone 3G an 3GS. Latest release of Ultrsn0w supports baseband 04.26.08, 05.11.07, 05.12.01, 05.13.04 and now 06.15.00. Strange but true iOS 4.1 baseband 05.14.02 and iOS 4.2 .1 baseband 05.15.04 are not supported with Ultrsn0w 1.2 But if you are stuck on Baseband 05.14.02 or 05.15.04 you can update your baseband to 06.15.00 and enjoy the Ultrasn0w unlock.


This time the procedure is very  different, first  you have to upgrade the baseband of the iPhone with the iPad 3.2.2 firmware and then you can unlock the phone with Ultrasn0w part, through Cydia. Following are the guides to update your baseband to 06.15.00

  1. Upgrade iPhone 3G, 3GS Baseband 06.15.00 with PwnageTool Unlock Edition (Mac)
  2. Guide to Update Baseband 06.15.00 With Redsn0w (Windows and Mac)
  3. Unlock iPhone 3G, 3GS Baseband 05.14.02 or 05.15.04 with Ultrasn0w

Theory : iPhone 3G/3GS baseband is same to iPad 3G. Apple blocked AT+XAPP hole with baseband 5.14.02 and 05.15.04 but the hole is still vulnerable with iPad 3G iOS 3.2.2 baseband 06.15.00 and the theory is to update your baseband to 06.15.00 and use the latest ultrasn0w to unlock.

Drawbacks : There are obvious drawbacks to this unlock method. Update the baseband to 06.15.00 is irreversible. Furthermore, it is not possible to update to future versions of the baseband, unless a higher version number than 06.15.00 This also means that you can expect problems if you try to update to official firmware versions from 4.2.1 IOS.

Warning : Certainly don’t update to 06.15 if you don’t need to!  Only do this if you need the unlock and you’re stuck on 05.14 or 05.15, and you’re willing to assume the above risks.


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Comments ( 23 )

Have Something To Say ?

  1. Rehmat February 3, 2011 Reply

    upgraded to baseband 6.15.00, 3GS , 4.2.1 but redsnow can not reboot it tried with recboot but still showing itunes / cable.
    Any utility to get out of recovery mode with new bootrom?

  2. Taisir January 13, 2011 Reply

    I have unlocked my iphone (3GS)… Thanks dev team very much .
    I Updated Baseband to 06.15.00 and every thing was ok
    Thanks again

  3. hitesh January 12, 2011 Reply

    i have iphone 3g with 4.0 FW base-band 5.13.04 now can i update my iphone if yes then which FW is better for me.

  4. James C December 7, 2010 Reply

    Hi I got a 3G running IOS 4.2.1 with a baseband of 05.15.04. I don’t have a carrier. What is the best thing to do? If i upgrade my baseband to 06.15.00, is it safe. Will the wifi and Carrier be activated?

    I really need your help guys! Thanks!

  5. Sam December 5, 2010 Reply

    Updated (3GS on 4.2.1 BB 5.15.04 previously) and it appears to work fine. Small issue with GPS (it’s off about 200M) but haven’t tried it moving around. I have noticed signal issues in that it seems my signal changes strength regularly in one location (could be AT&T network). Having difficulty with pictures/memory issues. When i go into Cydia it is telling me i’m out of memory but i have almost 5GB free on the phone. Is it the “base” partition size on the phone for the operating system? Suggestions on how to fix?

  6. Saur December 3, 2010 Reply

    Hi I have jailbreak and unlocked my 3g with redsnow and ullrasnow. It worked fine. After that my phone got synced with Itunes so I have runed erase/ reset all content.

    Now its keep going in dfu mode. I have tried to load custome ipsw by redsnow and itune again but it fails at installing activation bundle and get restarted comes back at dfu mode.

    please help me to bring my iphone back to life.


  7. Nic December 2, 2010 Reply


    I am on Iphone 3gs 3.1.2 baseband 05.11.07. (Use windows)

    Should I just update to 4.1 and wait till 5 comes out someday?

    Because from what I here there’s not too much difference between 4.1 and 4.2…..

    Anyy suggestions will come in handy!


  8. Maya Sahafi December 2, 2010 Reply

    I bought a 3G 14.5 GB that I immediately and stupidly upgraded to 4.1 (8B117) with 5.14.02
    Waited over a month for the unlock to come out and now that it has I’ve been banging my head into my desk trying to get the baseband to update to 06.15.00
    I’m probably doing something wrong, but as I’m a total novice I don’t know why I keep getting an error message that reads “No firmware bundle found! Would you like to search the web for this file?”
    I’ve tried repeatedly downloading the required firmware and saving it to my desktop, but nothing seems to be working.
    I’m probably making a stupid mistake and would greatly appreciate any help given.
    Thank you in advance.

  9. jasmeet December 2, 2010 Reply

    thanx very much for the unlock of 3g &3gs …..
    i would be pleased if u can tell …. when unlock of iphone 4 baseband 02.10.04 is coming??????

  10. jasmeet December 2, 2010 Reply

    thanx very much for the unlock of 3g &3gs …..
    i would be pleased if u can tell …. when unlock of iphone 4 ios 4.1 is coming??????

  11. isaak December 1, 2010 Reply

    After jailbreaking and unlocking with this method-
    I could not use itunes function with my iphone anymore
    how am I suppose to upload music and etc to my iphone now????

  12. sam November 30, 2010 Reply

    Thanks, it works! Done it with redsnow, the only thing I’m worried my battery dies too fast… hope it will bee fixed soon

  13. stuckedon05.15.04 November 30, 2010 Reply

    poor me accidentally updated my 3gs to 4.2.1(05.15.04)now got stacked nothing to do, wont unlock by that ipad basband..only thing that i have to do is wait till another FW’s come…Good luck you people who has not update via itune popup…

  14. javier November 30, 2010 Reply

    my iphone 3g 16gb was updated with the 4.1 ios but tried to downgrade to 3.1.3 but I lost the wifi and the bluetooth they appear in gray, and tried to update again to 4.1 to recover the wifi but doesn’t work. it still appear in gray, I tried also the restore factory and still appear in gray.

    If I update to 6.15.00 will be possible that enable the wifi and bluetooth or what can i do? right now i have a nice ipod touch for 2 months, someone can help me please????????

  15. smtsth November 30, 2010 Reply

    does it also hactivate iphone 3gs 4.2.1, bb 05.15.04 because i don’t have original/registered SIM.

  16. Infinity November 30, 2010 Reply

    Guys, Please do let me know the drawbacks of downgrading to 06.15.00. I am stuck with BB 05.15.04 and I would love to unlock my iphone but after reading different comments I am a little bit confused.

  17. Pak November 30, 2010 Reply


  18. Phil November 29, 2010 Reply

    Got a 3GS that I cannot JB- using redsn0w 0.9.6b4 and ISPW iphone2,1_4.2.1_8C148a_Restore.ispw , I get all the correct responses until the phone needs to be in DFU mode. At this point I get an error message telling me to use a different usb socket! Have attempted the JB in 3 different usbs with same result.
    Anyone help?

  19. David Moon November 29, 2010 Reply

    How about Baseband 02.10.04? Will this unlock work?

  20. D500 November 29, 2010 Reply

    is it normal that processing take long time?

  21. D500 November 29, 2010 Reply

    any chance for Windows users? =(

  22. Aamir November 29, 2010 Reply

    At last i have unlocked my iphone… Thanks dev team….. 🙂

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