downgrade iPhone 4.1 to any unlockable version?

Discussion in 'Jailbreaks and iOS Hacks' started by psychosinks, Oct 1, 2010.

  1. psychosinks macrumors newbie

    Oct 1, 2010
    last week i got a iPhone 3Gs. that was fully functional. it's the first time i handled iphone. in that time I've done 'erase content and settings' under settings menu on iphone. then my phone didn't boot up. i guess i deleted phone's OS also. i connected iphone to my PC, sync with iTunes and restored and updated. i've updated to iOS 4.1. and then when i inserted my SIM, it shows Sim not supported. and showing 'iTunes-data cable' image on iphone.

    some how I've inserted iPhone supported Foreign Country's SIM and got these menu. but not able to use phone anymore with bangladeshi SIM

    Version: 4.1 (8B117)
    Carrier: Carrier lab 8.0
    Model: MC147C
    Serial: 86930R2A3NP
    Modem firmware: 05.14.02

    i am frm Bangladesh
    can i downgrade this iphone??
    if there any step by step guide for me then help me
    some body help me plz..
  2. pixelated macrumors 6502a


    Oct 21, 2008
    I am afraid you cannot.
    Even if SHSH blobs (signature hashes used for downgrading the OS) have been saved for that device, downgrading to a previous version will not change your Modem Firmware which would be needed to unlock your phone.
    The only advice is to wait for an unlock to be developed for 4.1.
  3. Applejuiced macrumors Westmere


    Apr 16, 2008
    At the iPhone hacks section.
    Yes, like said above. No unlock available now.
    Just jb.

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