UltraSn0w Unlock for iOS 4.2.1 Problems: iPhone 4, 3G and 3GS

We already mentioned that the new UltraSn0w unlock for iOS 4.2.1 was to be released yesterday and now you can, we would love to know if you have had any problems with your new update.

iOS 4.2.1 was released about a week ago and a new RedSn0w jailbreak update followed it, well today we would like to hear from those that have used the new UltraSn0w unlock for iOS 4.2.1 that works on the iPhone 3G, iPhone 3GS with baseband 04.26.08, 05.11.07, 05.12.01, or 05.13.04 and those that have iPhone 4 with baseband 01.59.00.

This update could be a little tricky, iDB say that this is a little “special” and won’t be as simple as downloading UltraSn0w from Cydia, that is unless you are one of the above basebands, you do need to update your baseband to 06.15.00.

This is for the iPhone 3G or 3GS only, apparently you cannot update the iPhone 4 to baseband 06.15.00, and it will only work on iPhone 4 on baseband 01.59.00. Please read the following, as it is very important.

1. There is no way to come back down from 06.15, and there’s no hiding the baseband version from Apple. You’ll be voiding your warranty in a very obvious way.
2. If some future baseband comes out with a critical fix, you won’t be able to update to it if it remains down in the 05.xx sequence (then again, you wouldn’t update to it if you wanted to keep your unlock anyway).
3. Starting with FW 4.2.1 if you have 06.15 on your iPhone you won’t ever be able to restore to stock firmware (it will fail). You’ll need to only restore to custom IPSWs (then again, if you’re unlocker you should already be doing that).

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.

Please do let us know if you have tried the UltraSn0w unlock for iOS 4.2.1 as this will let other readers know if they should try it or not, your input and knowledge is very important to others. Thanks


46 thoughts on “UltraSn0w Unlock for iOS 4.2.1 Problems: iPhone 4, 3G and 3GS”

  1. Mark says:

    I have tried it but am still having to plug my phone in everytime i reboot it (thethered) even though i thought this new jailbreak was an untethered version. most probably me doing something wrong so any suggestions welcome please.

    1. Troy says:

      The new unlock for 4.2.1 for 3Gs MC model is tethered. Check your serial number, if it starts with an MC model then yes, it is tethered until the iPhone Dev Team can come up with an untethered jailbreak for it.

  2. alex says:

    I am new to this but i'm on baseband 5.14.01, upgraded to 4.2.1 through itunes then jailbroke using redsnow although i had tried the new pwnage tool but it kept saying I have 'the wrong bundle selected'. So downloaded redsn0w and still couldnt use so used 4.2.1 (3GS): iPhone2,1_4.2.1_8C148a_Restore.ipsw. It did jailbreak it as expected but when i treied the unlock using ultrasn0w 1.2 yet when i tried my t-mobiel uk sim it said 'searchign' and that 'activation could take some time'. All this and the fact that when i checked the baseband version, i was still on 5.14.01!! I must have done it wrong!! any help would be much appreciated!

  3. toomanyrobots says:

    iphone 3Gs from australia, trying to use my german carrier.

    i was stuck on 4.1 w/ updated BB so i created a custom ipsw from the ipad firmware. its now activated and unlocked, but it won't recognize my german network – "no service". any ideas?

  4. toomanyrobots says:

    apparently there was an error in the pwnage tool that i used regarding iphone 3gs 4.1 – they've corrected it w/ a new release of redsn0w for mac, which i am investigating right now. will keep you guys updated.

  5. toomanyrobots says:

    okay, fixed. new redsn0w does it all. 4.1 iphone 3GS unlocked w/ german carrier. big thanks to the dev team, it's been like 4 months since i've used my iPhone.

  6. Binu says:

    i have a 3gs and i used ultrasn0w to unlock it using 6.15 .00 basband. it was working fine with tmobile and later after i reeboot it , it got stuck. then later when it came up it became an ipad. there is no icon for phone and text. now i am stuck. it wont allow me to restore back or unlock.__anyhelp??

  7. ronald says:

    Iphone 3g already unlocked by devs team tutorial, but works 5 minutes and then goea to no service can anybody tell me whats wrong is there going to be a fix????????

  8. iphone 3g origin AT&T USA. Was on 4.1 (05.14.02), Downgraded to 3.1.3 kept 05.14.02 so upgraded to 4.2.1 and jailbroke that with redsn0w and 06.15.00. working fine until tried ultrasn0w. that wokred ok, using meteor (ireland) sim now but only getting patchy to no signal at all in area of high signal. keep resetting, airplane mode, reinstalling ultrasn0w but no use… help?!!

  9. Tommyz says:

    iphone 3g, originally 5.14.02, downloaded a custom 4.2.1 ipsw with bb 6.15.00 .. using snowbreeze to install..unlock with ultrasnow 1.2 .. using tmobile simcard.. keep saying searching..then NO SERVICE .. tried the method numberous time..even try to install a fresh copy of 4.2.1 and using redsnow to jailbreak.. still with no avail.. i think ultrasnow 1.2 still need more work ..

  10. Samuel says:

    hey guys, I've just had my 3g unlocked but there is a small problem with the Vodafone carrier. When I start a call there will be a the evil screen with "call failed" with the closing tune. Is there is a genius solution for this? or I've to obey the fate and continue with this problem. in any case big thanks to the dev-team.
    l..Egypt thanks…

  11. ChicoHamiltonsPants says:

    Got my 3g to baseband 6.15 but ultrasn0w not working. When my phone has no sim in it works fine in the sense that apps open, however as soon as sim it put in (t-mobile) the phone hardly works then usually rebots itself.

  12. jtce1 says:

    Help!!! I have a 3G and i used ultrasn0w to unlock it using 6.15 .00 basband. Just like Binu (above)… it was working fine with tmobile however it came up it became an ipad. there is no icon for phone and text. now i am stuck in recovery mode. it wont allow me to restore with ultrasn0w or unlock. Can you say BRICK… Help Please???

  13. Lordrifter says:

    Hey all, similar problems here. Jailbroke IPhone 3G with a custom 4.2.1 IPSW with BB 06.15.00, installed ultrasn0w 1.2 through cydia for unlock. Installed a new SIM from Telus (acutally Koodo, which is the same company as telus, I'm from Canada). The phone never finds service and eventually sits with "No service". Apps work fine and Wifi works fine. Under Settings->General->About the Carrier is listed as Telus 9.0. The SIM card seems to be read as under Settings->Phone there is a Telus Services submenu and under the Sim Applications submenu "koodo" is listed as the submenu title. However, when I go to Settings->carrier the only network it finds is "rogers wireless" which is the carrier the phone was originally purchased through. If I try to select that carrier I get an alert "Network Lost – Your selected cellular network is no longer available".

    Please help, any ideas?

    1. @leeheff says:

      have you had any success find the solution to the network lost problem? im currently searching the web like a madman looking for a solution, if you resolve the issue please post it as ill do the same.

  14. Khiz says:

    I was on 05.11.07 with iOS 3.1.2 working on TESCO Mobile network (O2 behind the scenes)
    I did the upgrade using iTunes 9.x, backed up the phone. Followed instructions by upgrading the ipsw file and then jailbroke it using redsn0w. Then installed the ultrasn0w patch and initially it said that it is searching the network but it didn't do anything.
    I had an O2 Sim which i inserted and now it says "no service", so I am kind of stuck 🙂
    I have contacted O2 and will get it unlocked legitmately.

    1. praveen says:

      updated to ios 4.2.1 with bb 5.15.04. jail break went good. but signal does not come. it keeps searching for network and says "NO Service". similar problem what you had. I am using vodafone india. what did you do to over come the problem?

  15. Chris says:

    ok. I have a 3g that i installed a fresh install from the itunes…. then i jailbroke it and i installed ultrsn0w and it did nothing and then i tried to install the tmobile package and it said that the firmware was too new… also that i couldnt use the activator because it was too new… idk what to do and it didnt change to the 6.15.. but it wont let me down grade at all… im a pc running itunes 10

  16. euro says:

    i have an iphone 3gs. i did the 4.2 update with the bb 6.15 using ultrasn0w. and i t worked fine for a day and a half. i downloadd some apps from cydia and i set it up for use with mms messaging and it asked for me to reboot. i know this is tethered JB so i rebooted it using redsn0w but now its a brick it freezes up on a pineapple for a while then says i have to plug it into itunes. now idk wat to do. help.?

  17. i have an iphone 3GS. I unlocked JB and unlocked with redsn0w. It was working great for a day and a half.. but i downloaded some apps again that i had lost from restoring it. I have a new bootrom so i know it was tethered and i had to reboot using redsn0w. I did but now its stuck on an apple logo and then goes to connect to itunes. i tried fixing this by restoring with a custom ipsw (4.2 BB 6.15) but itunes shows me an error message and doesnt perform the restore.. what can i do.. i need help x_x

  18. Ovidiu says:

    Will someone please reply to this guy? I'm having the same problem. Battery drain, Random data package access, no wifi, 80% of calls not coming in or going out. Springboard crashes. etc.

  19. julian says:

    i have an iphone 3g. jb and updated to 6.15 with redsn0w. ultrasn0w isn't unlocking the phone though. i've tried several different installing combinations but i keep getting stuck with a "no sim card" message

  20. mmaven says:

    I have an iphone 3g .jailbroken and unlocked via ultrasnow.. 4.2 redsnow 06.15.00 for some reason I have little to no signal all of the time.. anyone know of a fix?

  21. karl says:

    anyone actually worked out how to stop it showing no service yet ?

    i jailbroke 3g on 4.2.1 using redsn0w yesterday and tried unlocking sim carrier by repo666.ultrasn0w.com but still shows no service? doesnt even pick up what carriers can be used in settings?? dont know what bb its on but it was a fresh update to 4.2.1 yesterday via itunes 10.

    any help on this would be MUCH appreciated !!


  22. jose says:

    I never unlocked any phone before this is first time and I unlocked I phone 3g that i restored on itunes it had the 4.2.1 I used redsnow win9.6.b5 i opened it in this file iPhone1,2_4.2.1_8C148_Restore both being in the pwnage folder and it worked installing cydia using ultrasnow. Sorry if did not clarify certain things or clarified too much I don't know anything about phones unlocking etc…

    1. praveen says:

      Hi Bilal, i too have the similar problem. i am using vodafone. installaton went good. jail break also went good. it searches for signal and says "No signal". your problem seems to be nearer. what did you do to resolve the problem?

  23. guest AG says:

    i have done the jailbreak and the unlock on the phone using ultrasn0w…..however i can not get a t-mobile signal. All it says is searching for signal….Please help………..thank you

  24. David says:

    I have upgraded the base band of my 3GS to the iPad basement to allow me to unlock my 4.2.1 software. I used redsn0w and ultrasn0w to jailbreak and carrier unlock respectively. When I put my original vodafone aus sim in there is no network access for phone calls, however I am able to access the Internet (I’m writing this post). The same thing happens when I put an alternate sim in the phone. Through continuous uninstallation and reinstallation of both cydia and ultrasn0w I was allowed to make calls with the original sim only.

    I had an issue with the initial break trapping the phone in a recovery loop, but I got out of that with custom firmware. Potentially there could be an issue with the firmware’s compatability with ultrasn0w?

  25. Linda says:

    I successfully jailbroke my iPhone 3G but it says no service. I re-did it and it is still showing no service. When I try to view the carriers, it stays on “automatic” and it cannot find any other carriers. Help i’m going crazy!!!

  26. Blaqq_out says:

    i have iphone 3gs BB 05.14.02 i got UltraSn0w installed and it said "searching…" now says "No Service" and when i try to click Carrier in setting it tells me "Unable to Load Network List"

  27. As we know . All iPhone iOS versions except iPhone4 4.1(baseband 02.10.04) and iPhone4 4.2.1(baseband 03.10.01) had been unlocked by ULTRASN0W,But 2.10.4 and 3.10.01 can not unlocked by software .
    Gevey have release one Turbo sim .it can unlock 4.1(baseband 02.10.04) and 4.2.1 (baseband 03.10.01), with Gevey Turbo sim .Your AT&T Locked phone is free to use .Also it can support 3G network .Internet and Mail.
    Like Before firmware Gevey .easy Used . No Jailbreak needed! No software unlock! Not breaking your warranty!
    All apple fans who have the Iphone4(2.10.04,03.10.01) can use the Gevey sim unlock his Phone .
    You can see the Unlock Video (baseband 02.10.4,03.10.01) http://static.youku.com/v1.0.0140/v/swf/qplayer.s

    contact:info@mydalle.com or sale05@mydalle.com

  28. have iphone 4,modem firmware 01.59.00,updated to version 4.3.1 with the snowbreeze preserving firmware,so have now 4.3.1 with 01.59.00 and still can,t unlock the phone with ultrasnow,as i seen in the guide there is notice so just with my baseband iphone 4 can be unlocked with ultrasnow.anybody know the problem why i can,t unlock???thanks

  29. Anonymous says:

    hi just updated to bb 6.15 and used ultrasnow from cydia iphone was on o2 ,it will now work with tesco but still not with orange or vodaphone any ideas thanks

  30. Anonymous says:

    GSM MODEL iPhone 4S In Factory Box Unlocked.

    Anderson-TechieMobile(UK)”Now on Sales ”Smart-phones/Android Phones… We export internationally and Offer Promos to all interested customers

    International buyers; We make delivery right to your Doorstep at affordable Rates including Customs Duties Charges.

    See Below for International Buyers Promos Details:

    i Phone 4s:

    Available in Color (WhiteBlack) 16GB, 32GB, 64GB


    Place in your Order Today *Anderson-techiemobile@techie.com*

Live Comment

Your email address will not be published.