Updating from 4.1 to 4.2.1: Preserve baseband with TinyUmbrella?

Discussion in 'Jailbreaks and iOS Hacks' started by AdamA9, Feb 24, 2011.

  1. AdamA9 macrumors 65816

    Feb 2, 2010

    Been reading around on here and the internet and getting conflicting views from people so thought I would ask the question directly here.

    I have 4.1 on an iPhone 4. Using my iMac I want to update to 4.2.1 jailbreak and preserve my baseband, which is currently 01.59.00

    I have TinyUmbrella and Greenpois0n waiting (but no 4.2.1 file). I have read that TinyUmbrella will let me keep my baseband, but I've also read that I cannot do this for 4.2.1 - what is correct?

    Do I just need to follow these steps?

    1. Save SHSH via TinyUmbrella
    2. Download a 4.2.1 file from somewhere (anyone have a link?)

    ... then what? I'm not sure after this?

    Thanks for your patience guys :)
  2. himni, Feb 24, 2011
    Last edited: Feb 24, 2011

    himni macrumors regular

    Sep 24, 2009
    Download the correct ipsw from here

    open TU save your SHSHs and click start TSS server

    open iTunes with your iP4 connected and click restore while holding the cmd key (whatever it is called on an Apple keyboard it's shift for windows)

    Select the file you downloaded and it will install it and you should save your BB.

    TU has a walk through here

    I have down this multiple times and it has worked for me every time. I updated from 4.0 to 4.1 and now 4.2.1 and still have my 4.0 BB. You have to Jail break after you do this I think because 4.2.1 has a minimum BB version requirement.
  3. studmule macrumors regular

    Aug 29, 2010
    Himni is right. After you do the upgrade, your iphone will be in recovery mode, and tinyumbrella won't be able to kick it out. You have to use greenpois0n, put it in DFU mode and jailbreak it. This will also kick it out of recovery mode.
  4. hackthatphone macrumors 68000


    Jul 28, 2010
    Or just forget tinyumbrella and use pwnagetool to do this.
  5. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.
    Yep, since you're using a mac I'd just create a custom 4.2.1 with pwnage tool and restore to that.
    Pefect tool.
  6. AdamA9 thread starter macrumors 65816

    Feb 2, 2010
    Thanks guys.

    Cannot find solid instructions online on the best way to JB with pwnage tool, and preserving my baseband. Is there a reliable place on the intertubes to look?

  7. dhlizard macrumors G4


    Mar 16, 2009
    The Jailbreak Community
    The TU Mac version has been updated to kick out of recovery on 4.2.1
    Windoze version not available yet.
  8. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.

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