Is the iPhone 4 network unlockable on 4.2 if its currently unlocked on 4.1 ?

Discussion in 'Jailbreaks and iOS Hacks' started by Berges, Jan 21, 2011.

  1. Berges macrumors newbie

    Aug 12, 2010
    So I am currently using an ATT iPhone 4 unlocked using ultrasn0w. I am on 4.1 and baseband version 1.59.
    Post the 4.2 update there has been talk of a bunch of different details about an untethered jailbreak etc for the iPhone 4.
    I was wondering, is there a way I could update from 4.1 without upgrading my baseband version, getting an untethered jailbreak and thus being able to use the Ultrasn0w unlock?
  2. maturola macrumors 68040


    Oct 29, 2007
    Atlanta, GA
    It is hard to answer your question at this time, due to the fact that is not really an stable "Untethered" JB for 4.2.1 yet, the current beta avaliable is a bit messy and required you to use a 4.2B3 and have its shshs saved. You need to wait until the official untethred JB tool is release and may be offer a way to keep your baseband.
  3. Steven Jobson macrumors regular

    Jan 13, 2011
    Don't say "iPhone 4 network" to try to sound smart.

    Yes, you can preserve your baseband with TinyUmbrella
  4. Berges thread starter macrumors newbie

    Aug 12, 2010
  5. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.
    If you update from 4.1 instead of restore it still does.
  6. winterny macrumors 6502

    Jul 5, 2010
    It does, but you have to be very careful. I have 4.2.1 with baseband 01.59.00 working on my iPhone4, and followed this procedure:

    0) Start with an iPhone4 with baseband 01.59.00
    1) Make sure you have SHSH keys for 4.1, 4.2.1, and if you want to untether, 4.2b3.
    2) Set your /etc/hosts to either use Cydia or use TinyUmbrella's TSS server
    3) Put your iPhone in DFU mode
    4) use iTunes to RESTORE (option-restore) to factory 4.1
    5) When this completes, you will have an error because the baseband update failed (you want this) ... Use TinyUmbrella to "Exit Restore". Phone will boot up.
    6) Make sure /etc/hosts is still either pointed to Cydia or your TinyUmbrella TSS server
    7) use iTunes to UPGRADE (not restore!) to factory 4.2.1 (just click upgrade, or option-upgrade if you have the IPSW already saved).
    8) This will error out again because the baseband did not upgrade (again, you want this!), TinyUmbrella will be able to "Exit Recovery" as long as you used "Upgrade" and not "Restore"
    8) Use Redsn0w 0.9.7b6 to Jailbreak your phone (tethered) (even if you plan to untether, you must do the tethered jailbreak first).

    If you plan to continue tethered
    9) Use Redsn0w to boot your phone tethered

    If you plan to continue untethered
    9) If you plan to use Skype, install Skype now, the JB Monte hack needs to be installed after Skype otherwise Skype will not work (you can reinstall the JB Monte later on if you install skype later).
    10) Uncheck "Install Cydia" in Redsn0w.
    11) Use Redsn0w to install the "Jailbreak Monte" which requires the 4.2b3 SHSH keys and IPSW. If you are not a registered developer, this will require piracy, so if you'd like to do this without pirating, you will need to sign up and pay to be an iPhone developer.

    Good Luck!
  7. forcetactic macrumors 6502

    Jul 30, 2010
    I'd wait for the final version for untethered 4.2 before upgrading. It's not like 4.2 offers you a lot more benefits. Even 4.0 -> 4.2 doesn't offer much
  8. eastercat macrumors 68040


    Mar 3, 2008
    Wow. Thanks for the helpful instructions.
    I had been wondering if there was a way to keep 1.59 and use 4.2.1. I'm happy with 4.1, but I'll keep this in mind if I decide I really want 4.2.1.

  9. nebo1ss macrumors 68030

    Jun 2, 2010
    Steps 0,1,2,3,4,5 are all redundant since the op is already on 4.1 with 1.59 baseband.
  10. winterny macrumors 6502

    Jul 5, 2010
    Not necessarily.

    1) It's entirely possible to be running 4.1 jailbroken without your SHSH keys saved.
    2) Some people run into problems installing the 4.2.1 jailbreak after upgrading from 4.1 Jailbroken to 4.2.1. It's probably best to just re-install clean

    If it works for you skipping 0-5, great!

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