how to load 4.2.1 without upgrading baseband?

Discussion in 'Jailbreaks and iOS Hacks' started by ansabakhan, Feb 3, 2011.

  1. macrumors 65816

    ansabakhan

    Joined:
    Mar 3, 2010
    #1
    i deleted every thing from my phone by doing ERASE ALL , not i am stuck on apple logo , by reading different threads i know i deleted my ios.

    not i was on 4.0.2 with unlockable baseband , is there any way i can load 4.2.1on my phone without upgrading baseband?
     
  2. macrumors regular

    Joined:
    Sep 17, 2007
    Location:
    Santa Clara, California
    #2
    wondering the same thing, is there a way to upgrade to 4.2.1 without upgrading the 01.59.00 baseband?
     
  3. macrumors 68000

    hackthatphone

    Joined:
    Jul 28, 2010
    #3
    You have to dfu restore to get out of that erase mode. Hope you have SHSHs on file for anything lower than 4.2.1. Restore to 4.1 or lower then come back up to 4.2.1 to save that baseband.
     
  4. Gizmotoy, Feb 3, 2011
    Last edited: Feb 3, 2011

    macrumors 6502a

    Gizmotoy

    Joined:
    Nov 6, 2003
    #4
    That's the part he's asking for directions for. How to update to 4.2.1 without updating the baseband. Unfortunately OP, I don't have an answer for you.

    I suspect this may still work, but I couldn't say for sure:
    http://www.dkszone.net/update-ios-41-upgrading-baseband-15900-21004
     
  5. macrumors 68040

    eastercat

    Joined:
    Mar 3, 2008
    Location:
    PDX
    #5
    Using blobs to preserve bb only works for iphone4. Otherwise, you have to use custom firmware.
     
  6. macrumors 68000

    silverblack

    Joined:
    Nov 27, 2007
    #6
    Go to his site (his signature) for detailed instructions on how to do it - hackthatphone
     
  7. macrumors 68000

    hackthatphone

    Joined:
    Jul 28, 2010
    #7
    Appreciate that, but my newer jailbreak/unlock tutorials are members only, which is why I never post and link to those on forums. The great majority of my site is accessible to all however.
     
  8. macrumors 6502a

    Joined:
    Apr 3, 2010
  9. thread starter macrumors 65816

    ansabakhan

    Joined:
    Mar 3, 2010
    #9
    I am not sure what SHSHs i have saved .. i installed cydia almost a month back , so i believe i might have 4.2.1 shsh saved altleast...but i didn't notice what SHSHs it showed me as saved so this is just a guess .... is it necessary for me to restore to 4.1 before jb 4.2.1 in order to have unlock baseband?

    or should i wait for pwnage tool to release where they have the option of not upgrading the basband or it doesn't matter in my case ? as i have already deleted the ios and have to get in 4.1 or lower before any thing ?
     
  10. macrumors 6502

    Joined:
    Oct 12, 2009
    #10
  11. thread starter macrumors 65816

    ansabakhan

    Joined:
    Mar 3, 2010
    #11
    on his instructions

    http://thefirmwareumbrella.blogspot.com/p/prevent-iphone4-baseband-update.html

    4. Plug in your device and save SHSH (make sure 4.2.1 SHSH were saved, if not don't bother continuing)


    i m in DFU mode and i dont think i can save SHSH while its stuck in DFU due to 'erase all' i did on my phone
     
  12. macrumors 6502

    Joined:
    Dec 4, 2008
    #12
    Do you know your ECID or have you used TinyUmbrella before? You can either create a manual device with your ECID or select you device under Recent Devices and save all SHSH's without having to connect your phone.
     
  13. macrumors 604

    labman

    Joined:
    Jun 9, 2009
    Location:
    Mich near Detroit
    #13
    Iclarified have some assume and free tutorials and YouTube has some great ones too if your the video type and again free.
     
  14. thread starter macrumors 65816

    ansabakhan

    Joined:
    Mar 3, 2010
    #14
    when i did ERASE ALL i was on 4.0.2 and now if i try restoring (with custom file) to get on 4.2.1 i get 1601 error ? cant i go to 4.2.1 ? as i dont have any iOS on my phone .. i am confused
     
  15. macrumors Nehalem

    Applejuiced

    Joined:
    Apr 16, 2008
    Location:
    At the iPhone hacks section.
  16. thread starter macrumors 65816

    ansabakhan

    Joined:
    Mar 3, 2010
    #16
    after i did earse all and stuck on apple logo , Umbrella is not detecting the type of device and its firmware, basically its not showing any device connected.

    has any one else had any luck with reading SHSH after erase all ?
     
  17. macrumors regular

    Joined:
    Jun 26, 2009
    #17
    What is the current (latest) base-band associed with i OS 4.2.1?
    My current base-band under iOS 4.1 is 02.10.04, do I need to preserve it?
     
  18. macrumors regular

    Joined:
    Jan 13, 2011
    #18
    You can't unlock it so don't even bother continuing.
     

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