Download Links Updated.[18 August]
update : use this post iOS 4.2.1 Custom Firmware without Baseband update – Untethered Jailberak [Feb 2012]

If you are an unlocker and know about 06.15.00 unlock method with ultrasn0w 1.2 , there is a simple way to update to iOS 4.2.1 without basebande update with pwnage tool 4.1.3 . easy unlock and jailbreak But its need you have 05.13.04 bb or below.

unlock 4.2.1

Tools needed

1 . Custom firmware for iphone 3Gs / 3G  4.2.1

  • Download custom firmware iPhone 3Gs / {Mirror} –> [Hotfile | FileSonic]
  • Download custom firmware iPhone 3G   / {Mirror}–> [Hotfile | FileSonic]

2. Download Redsn0w 0.9.6b

3. Download Apple original firmware

Guide :

 

1. Connect your phone with PC and switch off

2. Open redsn0w and choose Original firmware.

3. If you have newboot just press “yes”

4. now click “Next”

5. Choose “Just Enter pwned DFU mode right now”

6- now click “Next” again “Next” and follow the screen.

* you can useb iReb for pwned DFU mode too.

After that open itunes and press “Shift + Restore” and choose custom firmware 4.2.1

it will finish very quickly

Once you update you firmware

1. Connect your phone with PC and switch off

2. Open redsnow and choose Original firmware

3. If you have newboot just press “yes”

4. now click “Next”

5. Choose Only “Install Cydia”

6. now click “Next” again “Next” and follow the screen.

If you r getting White Cydia Icon just switch of your phone and open redsnow choose Stock firmware 4.2.1 and choose the option “Just boot tethered right now” and click “next” again “next” then follow the screen then you will see the cydia.

Finally you can see your phones is with your old Baseband. now just you can install the ultrasn0w 1.2 from Cydia

Activate iPhone 4, 3GS, 3G Without Original SIM or Hacktivation with SAM & Redsn0w 0.9.6b6

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116 Responses to “iOS 4.2.1 Custom Firmware without Baseband update”

  1. Yeming says:

    my Itunes gives an error 2003 when its done recovering from the custom iOS. Than my iPhone reboots and it quits after you disconnect from computer and when you turn it on it says connect with iTunes.

  2. Apple iPod says:

    That is Right
    Now You Should Active Your Device
    Connect Your Device To iTunes And Fill Request Fields
    http://upload.ir-tci.org/files/3/picture/active-3.jpg
    Sure Your Are Connect To internet
    Note : if Your Device is Lock you Should Insert Original Sim Card into device and then active your device and at finish u can insert your Sim card

  3. Yeming says:

    No, i fixed it, it was something with my itunes. When it finished restoring the custom firmwire, everything was done. it was ios 4.2.1, cydia was already on it everything… it was jailbroken but not activated and not unlocked… I found this pretty perculiar but anyways;
    Problem is, i want to unlock my phone, but ultrasn0w gives you battery drainage. i dont have a orginal simcard of carrier, my phone is from China…. and i live in Holland… I want to use SAM but is that possible without updating to 06.15.00 ? I tried SAM with my baseband 05.11.07 ( iphone 3G) but it didn’t work with AUTO-DETECT and iTunes keep saying invalid SIM but iPhone works fine except for the brain drainage… help ?!?!?!

  4. Apple iPod says:

    u should update baseband to 06.15.00 , then restore device with
    ios 4.2.1 custom with basebasn 06.15.00 Unlocked
    (for 3G Lock Factory)
    follow this Post :
    http://iphonerock.com/unlock/custom-firmwares-for-unlocking-06-15-00-basebond-iphone-3g3gs.html

  5. becha says:

    Good morning and thank you for yor help.
    I fallowed this tuto and now my iPhone 3GS (not activated) on FW4.2.1 with BB05.11.
    My question is: Can I use Redsn0w now without activating my iphone with an original sim card.

  6. becha says:

    Thank you for your replay.
    I did it and now my iphone 3GS (New bootrom) is on jailbreaked FW4.2.1 with BB05.11. Now I’m installing ultrasn0w to unlock.
    Just the problem is tethred (always I must use redsn0w to boot my idevice).
    This is my exrience with…
    Thanks

  7. Apple iPod says:

    iOS 4.3Beta Released & Early Will Release New Jailbreak Tool For iOS 4.2.1 or 4.3 (Untethered)
    Good Luck

  8. Tico05 says:

    I update an Iphone 3GS to ios 4.2.1, after redsn0w it start to work but the WiFI function did not work so I enter to setting to verify the firmware and everything, in that moment I note that there was not anything the baseband was NOT installed… After a few seconds it gave me a message: the iphone not received or make calls it need to be restore.
    What happen?????? what mode is that???

    Help

    Thanks
    eduvenal@hotmail.com

  9. Junzen says:

    Just a question, will this hacktivate my iPhone?? Thanx in advance for reply… :DDD

  10. Junzen says:

    So this will bypass the “Slide for emergency” screen?? ‘Coz I’m not on an official carrier…

  11. Sascha says:

    Hey, i am stuck on the “downloading jailbreak data” screen.
    Can anybody help me out pls.

  12. hello says:

    i have a question i have 4.1 version right noow and its baseband is 6.15.00
    and the question is (is this custom firmware will work with this??????

  13. pl says:

    hey guy ! when the official jailbreak for 3gs 4.2.1 will come out ?

  14. hello says:

    its gives me error 21

  15. deea says:

    Hello,

    When i must to activate? Before jailbreak?

    • Apple iPhone says:

      if you have original sim cart , active before jailbreak . but if have not redsn0w active yr iphone

  16. javiher says:

    Dude best tutorial works percfect on my iphone 3g tnx

  17. Joel C. says:

    I have a 3G with 3.0 firmware and 04.26.08 baseband… ¿this works for me?…thanks!

  18. Kerich says:

    Thanks! worked great.

    However, i didnt have to go through the second procedure below.

    “Once you update you firmware
    1. Connect your phone with PC and switch off
    2. Open redsnow and choose Original firmware
    3. If you have newboot just press “yes”
    4. now click “Next”
    5. Choose Only “Install Cydia”
    6. now click “Next” again “Next” and follow the screen.”

    Also, my background screen appears black.. how can i add the wallpaper?

    Cheers.
    Dru

    • Apple iPhone says:

      setting > wallpaper

      • Fabs says:

        Hi, I have the same problem, my wallpaper is black. I tried several times to change it thru settings>wallpaper, as well as using winterboard>user wallpaper. Nothing happened.
        Any clue about it ?

        thanks

        Fabiola

  19. hello says:

    hey man i activated my iphone but it is no connecting to itune after updating

  20. hello says:

    If you r getting White Cydia Icon just switch of your phone and open redsnow choose Stock firmware 4.2.1 and choose the option “Just boot tethered right now” and click “next” again “next” then follow the screen then you will see the cydia.

    i did this but i cannot open cydia helppppppppppppp

  21. Alex says:

    Hey, I’ve managed to restore, but I’m stuck when ‘Downloading Jailbreak Data…’ appears on the phone. I’ve tried to restore twice now but same thing happens… I have an original SIM card, therefore the phone gets through activation sign into menu. I’ve also tried ‘Just boot tethered right now’ also no progress. Can you help me please?

  22. Alex says:

    What a relief! I have managed to successfully complete this restore, including jailbreak and unlock. Thank you very much, big time!
    I’ve solved my problem by watching this video, take a look if you have a similar situation.

    http://www.youtube.com/watch?v=AC_7HePZ8aQ&feature=feedlik

  23. John says:

    Hey, thanks for the tutorial; this worked great on my 3GS. One issue, though: I’m on AT&T, and the phone activated fine through iTunes and I’m getting fine signal and bars. However, I’m not getting a carrier name in the upper left of the screen like I should be. Also, my Network is displayed as “Not Available” under the About screen in general settings. Is there any way to get my carrier name back? I’ve tried MakeItMine but it didn’t work.

    • Apple iPhone says:

      do you respring after using makeitmaine ?

      • John says:

        Yes. I’ve tried installing AT&T carrier logo from Cydia as well, but still not getting anything where the carrier name should be.

        • John says:

          Okay, I fixed it. Here’s what I did in case anyone else is having this problem. I installed Fake Operator from Cydia to try to put some custom text where the carrier name would be, but weirdly, instead of applying my custom text, this restored the stock “AT&T” .png file (which is just the text “AT&T”). I then tried reinstalling AT&T Carrier Logo from Cydia (not the version for iPhone 4, since I have a 3GS), but this didn’t apply the logo like I wanted. So I used iPhone Browser to navigate to the System/Library/Carrier Bundles/iPhone folder, and found a folder where the stock AT&T .png files were still present (the folder was entitled 310150 for me). I then copied the custom AT&T carrier logo .pngs from the Cydia package into this folder to replace the stock ones, and viola! My nifty at&t custom carrier logo I had back on iOS 3.x is back! My network is still showing up as “Not Available” under my About screen in the general menu under settings, but this doesn’t seem to be affecting anything. Guessing it’s just a quirk of keeping my old 4.26.08 baseband with a version of iOS that wasn’t designed for it.

          Now I’m considering changing the signal bars back to the way they were in 3.x as well; I don’t like the distorted look Apple gave them after antenna-gate. Anyway, thanks again for the tutorial; my iPhone is running great after being bogged down for a while with a jailbroken iOS 3.2.1. Not having to install WinterBoard should keep things running a lot better.

  24. hello says:

    am successfully done but is there any solution to get rid of (just boot tethered right now) everytime i reboot i have to use this so its so annoying
    plz help

  25. Joel C. says:

    Works for me on iPhone 3G with 3.0 firmware and 04.26.08 baseband… THX!!

  26. ImdyingwithoutCYDia says:

    ok hours and hours of reading forums and googling my head hurts and i cant sleep till i fix it

    my problem is i upgraded my 3gs from 4.0.1 with the jailbreakme.com jailbreak which was an asshole move for the simple fact my freaking power sleep button doesnt work i was using activator to make it sleep an such now how do jailbreak again with the alternative dfu mode i have been reading about someone please put it in noob terms for me

  27. escaper says:

    here what I did for my iphone 3g
    1. Connect your phone with PC and switch off

    2. Open redsn0w and choose Original firmware.

    3. If you have newboot just press “yes”

    4. now click “Next”

    5. Choose “Just Enter pwned DFU mode right now”

    6- now click “Next” again “Next” and follow the screen.

    * you can useb iReb for pwned DFU mode too.

    After that open itunes and press “Shift + Restore” and choose custom firmware 4.2.1

    because this custom firmware already had cydia add into it therefor do not use redsnow to install cydia

    open cydia then install ultralsnow then your phone will activated after reboot

  28. deea says:

    escaper , it s better 4.2.1 live 3.1.3? on 3g?

  29. Bert says:

    Hi,

    I followed the steps carefully.
    Everything went well, but after installing Cydia the apple doesn’t disappear, it keeps rebooting.

    Can someone please help me?

    Thanks.

  30. ophirsky says:

    hi !
    can i use the 4.2.1 custom ipsw (no modem upgrade) .with the new greenpoisi0n rc5? wil it jailbreak?

  31. Shah says:

    I have 3gs still on 3.1.2 baseband 4.26.08, I’m going to upgrade using greenpoison, what is the best way to upgrade to 4.2.1 and be able to unlock with ultrasnow? Do I have to upgrade my baseband or can I keep it as it is?

  32. Phone i says:

    i have a 3g i want to unlock it. i reflashed the firm to 4.2.1 updated the baseband ipad jailbroke it.installed ultrasnow though cydia phone searches for network,,,lost as to what to do//

  33. Shah says:

    thank you Apple iPod for responce, I have read the sections you suggested, but am unsure if tinyumbrella TSS server will work on 3gs to prevent baseband update as it does for iPhone 4.

    If it does not, then the custom firmware section only deals with how to use with a mac or redsnow, but I want to use greenpoison for windows, can someone publish a 3gs maintain baseband to unlock and upgrade to 4.2.1 guide, thanx

    • Apple iPhone says:

      you cant use Tinyumberella . you have two way ! 1- use custom 4.2.1 then jailbreak with GP again 2- use iPad baseband for unlock
      PS : if you are Persian feel free to write Persian ;)

  34. [...] 3G : 1- if your baseband is 05.13.04 or lower simply use iOS 4.2.1 Custom Firmware without Baseband update 2- if your baseband is later than 05.13.04 use Custom Firmwares for Unlocking 06.15.00 Basebond [...]

  35. Murali says:

    I have a iPhone 3gs running on iOs 4.0 with baseband 5.13.04…

    Its already jail broken and unlocked.. I never cared abt the apple’s new iOs versions as I am happy with what I have now..

    But my phone has suddenly started to reboot for every 3 to 5 mins.. So, I am planning to update to latest iOs version… Please let me know if the below process will work…

    1. Boot in DFU mode using redsnow.
    2. Use iTunes and restore using custom firmware provided by you in this page. (After restore, will I still be with my 5.13.04 baseband)??
    3. Jailbreak using the new greenpoison RC5 tool..
    4. Unlock using unltrasnow

    Will this work???

    Whats your thought on this…

    If it wouldnt work, whats the best way to get a untethered jailbreak with unlock for my phone after upgrading to 4.2.1…

    Thanks.

  36. Apple iPhone says:

    yes , boot in custom mod with redsn0w
    and you are right

    • Murali says:

      Hello.. I got into DFU mode and restored then using custom version.. It took all its time and at the ended it said restore failed with error 29… Now my iphone is showing the USB >> iTunes picture and now also iTunes is detecting the phone in restore mode only.. If i try to restore with custom version it fails with error 21 just soon after starting to restore.. Now my iphone is stuck showing the Connect USB >> iTunes picture… :(..

      Need help on what to do and how to proceed……

      • Apple iPhone says:

        do you use redsn0w for Entering pwned DFU mode or not ?

        • Murali says:

          Yes I did the restore only after doing tat..

        • Murali says:

          Since it fails only in the last moment of software update, what will be the state of my phone? Will it have 4.2.1 or 4.0??

          If I take to apple store claiming for waranty, will they be able to find if it was a jailbroken phone? Or will this new custom firmware will already have cydia???

          • Apple iPhone says:

            hum
            if you wanna take it to apple store why dont try original 4.2.1 firmware ? it will be ok . but your baseband will upgrade
            tell me about your ios version

          • Murali says:

            I took it to apple store nearby and they tried to restore with original version.. That also didnt work… Dont know whats the problem now…

            They cant replace since I am in a different country from where i purchased… :( :(

            Any helppppp guys???

          • Apple iPhone says:

            1- if you have firewall ro antivirus disable it !
            2-if you have 4.1 shsh Try iREB then using 4.1 custom frimware
            3-if it doesn’t work leave yr iphone power on until battery empty
            then leave it for 1-2 day then try again
            I have no idea more

  37. [...] the following site reliable for my situation ? iOS 4.2.1 Custom Firmware without Baseband update – iPhone Thanks Quote [...]

  38. John Gotti says:

    I have an iPhone 3GS on 05.13.04.. will this work and can I jailbreak with greenpoison?

  39. John Gotti says:

    Igght.. I Will Try & update You..!

  40. John Gotti says:

    It WORKED!!!

  41. deea says:

    affect battery life?

    • Apple iPhone says:

      use this post
      http://iphonerock.com/unlock/activate-iphone-4-3gs-3g-without-original-sim-or-hacktivation-with-sam-redsn0w-0-9-6b6.html

  42. intan says:

    My phone stuck with problems for 1 week. and i’ve google for help but ended with ^&*(*&&. My boss recommend yur link and guess what, i’ve followed the instructions/steps with extremely careful and i got everything fixed!!! Love you!! and love my boss too!

  43. IS THIS AN UNTETHERED JAILBREAK?

  44. Anthony says:

    Hello, i bought a jailbroken iphone 3g pff craiglist yesterday and when i tried to restore it, it said error 1015 and now im stuck in recovery mode. What should i do to get it to at least get to the locked screen.

  45. Jeff says:

    Hi,
    My new bootrom 3GS with 3.1.2 and BB 05.11.07 now JB with spirit and unlocked by blacksn0w, I didn’t have original SIM, can I update with this custom firmware and JB with greenpois0n and unlocked by ultrasn0w? will I stick at the Emergency call screen?

    • Apple iPhone says:

      Hi
      Greenpoisi0n RC4 ( for ios 4.1 ) is a hackactive
      but new version RC5 seems isn’t a hackative so you need a original sim cart
      or if you have ios 4.1 shsh update with ios 4.1 custom frimwares

  46. erve34axim says:

    Works perfect on 3G, stuck at uploading jailbreak data, if use windows 7 you need to right click on redsnow and check compatibility mode to Windows XP SP3 and run as Administrator, then works fine….

    Only problem is that as people above have black wallpaper, lock screen is fine and show image but cant set it behind icons, also try to use winterboard and no luck.

    Any ideas or solution?

  47. erve34axim says:

    Solution found for missing wallpaper!

    Use iPhoneBrowser or SSH, navigate to:

    /System/Library/CoreServices/SpringBoard.app/

    find:

    N82AP.plist

    copy to PC, use text editor and look for string:

    homescreen-wallpaper

    change it to:

    homescreen-wallpaper

    save, and copy that file to phone on same place, reboot device and all works fine :)

    Also you can turn on multitasking with editing string:

    multitasking

    to

    multitasking

    but didn’t test that.

  48. erve34axim says:

    website do not allow strings, so thing you need to change is false to true.

  49. simosc76 says:

    i have 3g . after i upgrade to 4.2.1 and bb 06.15.00 i lost my gps . how i can fix it? can i make downgrade the bb? also after i make this solution with custom firmware i find a problem . i try to sent sms to a number from my recent call list and my system going to safe it mode.how can i fix this?

  50. bostongeorge says:

    so this is what i did with my iphone 3gs. i had 3.1.3 firmware.

    1. Connect your phone with PC and switch off
    2. Open redsn0w and choose Original firmware.
    3. If you have newboot just press “yes”
    4. now click “Next”
    5. Choose “Just Enter pwned DFU mode right now”
    6- now click “Next” again “Next” and follow the screen.
    After that open itunes and press “Shift + Restore” and choose custom firmware 4.2.1

    I THEN JAILBREAK WITH greenpois0n.

    i got a White Cydia Icon so i just switch off my phone and open redsn0w choose Stock firmware 4.2.1 and choose the option “Just boot tethered right now” and click “next” again “next” then follow the screen then you will see the cydia.

    THEN VOILA!! I HAVE AN IPHONE 3GS ON 4.2 BB 5.12.01 UNTETHERED JAILBROKEN AND UNLOCKED.

  51. Fabrizio says:

    HI!!! please help!

    i actually updated my iPhone 4 to 4.2.1 and the baseband has updated too. The jailbreak is don, but i can’t unlock with ultrasn0w.

    so nowthat’s Pwnage is out, i can restore it with a custom firmware (without baseband update) , right???

    SO WHERE DO I FIND A CUSTOM FIRMWARE FOR IPHONE 4 !!!?? pleeeeeeaaassseeee!!!!!!
    i only can find custom firmwares for 3g/3gs…

    thanks!!

  52. mitoumag says:

    hi
    i hawe a problem my iphon 3g is i decovery mode and vhen i try to restore it in itunes, itune pop up 1015 error can someone help me i try and nothing every tim pops me 1015 error and put`s my phone in recovery mode and i can`t do anything please heeeelp me i am desperate :(((

  53. george says:

    when i try to add the custom software, itune tells me the firmware file is not compatible. Can anybody help me?

  54. [...] many methods to go back to 4.1.2 with no luck. 5 I have tried: a) Shift+restore in itunes to this custom firmware without baseband update, gives me error 1015. I have tried to run the latest greenpois0n (rc6.1) [...]

  55. [...] iOS 4.2.1 Custom Firmware without Baseband update – iPhone Activate iPhone 4, 3GS, 3G Without Original SIM or Hacktivation with SAM & Redsn0w 0.9.6b6 [...]

  56. [...] 4.2.1 met behoud van baseband 05.13.04 met een custom FW. dit zijn de stappen die ik gedaan hebt: iOS 4.2.1 Custom Firmware without Baseband update is ook gelukt echter is deze afhankelijk van een unlock ultrasn0w deze heb ik geinstalleerd versie [...]

  57. [...] jednak miałem iPadowy, więc już za późno, ale udało mi się włączyć iPhone'a. Oto link: iOS 4.2.1 Custom Firmware without Baseband update Cytuj   + Odpowiedz na ten [...]

  58. [...] be able to make a custom 4.2.1 I believe. Reply ajpepe72 08:51 AM Today cool, found this guide iOS 4.2.1 Custom Firmware without Baseband update Does tat seem accurate for my needs ? Reply [...]

  59. [...] right now, nie przynosi, żadnych efektów. Próbowałem jeszcze zrobić według tego poradnika : Download iOS 4.2.1 Custom Firmware without Baseband update | iPhoneRock Również, bez żadnych efektów. @neros Dzisiaj sprawdzę tą taśmę i edytuje post. [...]

  60. [...] tengo windows pero ya he conseguido instalar un firmware 4.2.1 el que me salia en esta pagina http://iphonerock.com/jailbreak/ios-4-2-1-custom-firmware-without-baseband-update.html lo que no entiendo es que si es un firmware pirateado no esta l'aplicacion de cidia… el principal [...]

  61. [...] było używać database od iPad'a ale to kicha stabilność więc szukałem czegoś innego): Download iOS 4.2.1 Custom Firmware without Baseband update | Jailbreak Unlock iPhone iPod iPad Free Robię wszystko jak tam jest zamieszczone, ale pojawia się problem. Po pierwsze (jak w [...]

  62. Anonymous says:

    [...] Hola gente, nuevo en el foro… A mi me sucede lo mismo… El custom firm lo descargue de aqui: Download iOS 4.2.1 Custom Firmware without Baseband update | Jailbreak Unlock iPhone iPod iPad Free Al parecer ya tiene la extencion IPSW Lo que me paso es que le hize el jailbreak… paso [...]

  63. [...] čas držalo. Jednalo sa o to, že oficiálny firmware tam už nemôžem nahrať ale iba upravený (custom firmware). Tak som si našiel najnovší custom firmware 4.2.1 a cez iTunes som ho nahral do iPhonu  … [...]

  64. [...] Download iOS 4.2.1 Custom Firmware without Baseband update …Dec 10, 2010 … Finally you can see your phones is with your old Baseband. now just you can install the … http://upload.ir-tci.org/files/3/picture/active-3.jpg … [...]

  65. [...] albo było tylko menu z ikonką od Itunes. Natknąłem się wczoraj na tym forum na link do strony Download iOS 4.2.1 Custom Firmware without Baseband update | Jailbreak Unlock iPhone iPod iPad Free i tu jest mały sukces bo telefon się uruchamia, jest menu jest Cydia, nie ma tylko zasięgu i nie [...]