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Discuss 3GS + Old Bootrom - always able to downgrade baseband? at the iPhone 3GS -; Hi, I just want to ask if I have an original model 3GS (old bootrom ...
  1. #1
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    Default 3GS + Old Bootrom - always able to downgrade baseband?


    I just want to ask if I have an original model 3GS (old bootrom - 359.3) with any given version of the firmware (lets say 4.3.2) and have already upgraded to the latest baseband, can I always use the bootrom exploit to downgrade my baseband and firmware to an unlockable iteration (no matter what security measures apple adds in the meantime)?

    I don't quite understand the relationship between the shsh files (which seem to be per OS version), the baseband and the bootrom. Is it possible that I will be left with a phone that can not be unlocked or will it ALWAYS be possible via the bootrom exploit?

    For the record, I currently have 4.3 installed (non-jailbroken). I jailbroke 4.2.1 in the past and saved my .shsh files from Cydia without really knowing what it means.

    The most important thing for me is to enable the phone to be unlocked in the future as I plan to move to a different country and I love my 3GS and wish to continue using it in a PAYG plan.


  2. #2
    Super Moderator Array Olethros's Avatar

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    There is no public technique to downgrade baseband on 3GS (old or new bootrom). SO if you have updated to 4.3.2 and allowd the baseband to also be updated then you are not in a good situation if you ever want to unlock later.

    There is a solution involving the iPad baseband that shipped with iOS 3.2.2 but it is recommended you try and avoid this if you possibly can.

    Only the iPhone 4 uses a SHSH technique for the baseband, so SHSH is not relevant to baseband updating/downgrading on a 3GS (or 3G)

    Unlocking via ultrasn0w requires that you can restore and re-jailbreak your iPhone (preferably untethered). This is the only connection you really need to think about.

    The SHSH is required for restoring the OS, and is only really required for new bootrom 3GS and more recent iPhone, iPad iPod Touch models - but it is recommended for all devices that can use a SHSH.
    Please read the stickies & search forum before posting!
    How to report an iTunes restore/update fail in a useful manner

    iPad 3G 64GB (4.3.3, Redsn0w) oldest SHSH 3.2.2
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    iPhone 3GS 32GB (4.3.3; Pwnagetool) factory unlocked oldest SHSH 3.1
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