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Discuss Can some older 3GSs be unlocked while leaving the GPS chip active? at the iPhone 3GS - Hackint0sh.org; This is sort of a consolidation of a few older threads. I bought a used ...
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    Default Can some older 3GSs be unlocked while leaving the GPS chip active?

    This is sort of a consolidation of a few older threads. I bought a used 3GS that was jailbroken and unlocked, and eventually found that the GPS chip was no longer active, due to being jailbroken. The baseband had been upgraded to 06.15.00. Apparently this is a one-way path - my phone can't have its old software restored and get the GPS chip running again, though everything else works fine and it still gets location data from WiFi and cell phone towers.

    But I've heard that if I get an older 3GS that has certain (fairly early) versions of the soft ware still in place (these are becoming increasingly rare as old 3GSs get upgraded), there is certain way to jailbreak and unlock one of these rare older 3GSs, such that the old baseband is left in place, and the GPS chip keeps running.

    Is this true? Anybody know of any concrete details?

    Is there *ANY* 3GS that can be unlocked and jailbroken, and wind up with the GPS chip still running and everything else still working? Most can't, I understand, but there may be a few that still can.

    I found a list of "unlockable basebands" for the 3GS, that lists a number of them:

    Unlockable :
    5.11.07 3Gs I/U (iPad baseband needed, then use Ultrasn0w)
    5.12.01 3Gs I/U (iPad baseband needed, then use Ultrasn0w)
    5.13.04 3Gs I/U (iPad baseband needed, then use Ultrasn0w)
    6.15.00 3Gs U (This is the iPad baseband. Use Ultrasn0w)

    Convert-able + Unlockable :
    5.14.02 Convert-able to 6.15.00 3Gs
    5.15.04 Convert-able to 6.15.00 3Gs
    5.16.00 Convert-able to 6.15.00 3Gs
    5.16.01 Convert-able to 6.15.00 3Gs
    5.16.02 Convert-able to 6.15.00 3Gs

    I'm not sure how "convert-able" basebands differ from "unlockable" basebands.

    But this sounds to me like the ONLY way to use a 3GS on T-Mobile, is to jailbreak it and then unlock it... and the ONLY way to do that is to install this 06.15.00 baseband, which apparently disables your GPS chip in the 3GS.

    Am I interpreting this table correctly?

    Or is there any way to unlock a 3GS (if it starts with the "correct" baseband) and use it on T-Mobile, while leaving the GPS chip still running and useable?



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    Well, on another forum I found the following advice:

    You want one with a baseband of 5.13.04 or lower. If you feel you'd like functional GPS on the device, you'd want to avoid ones that have the upgraded baseband of 6.15.00. The use of the iPad bb (6.15.00) on iPhones forces the 3GS to only be able to upgrade/restore with custom firmwares on iOS 4.2.1 and higher. The baseband affects unlockability. Consider if you're okay with dealing with the 6.15.00 baseband, also consider negotiating the price with the seller bc it's kind of like a handicap. That baseband is not able to be downgraded either.

    As for jailbreakability, if the seller knows, try to get an old bootrom version. Those are always untethered jb. If it's new boot, on 4.3.4 and higher, all jailbreaks on the device will be tethered/semi-tethered.

    Ultimately you'd want to buy one with a baseband of 5.13.04 or lower. The firmware version on a new boot preferably should be 4.3.3 or below. On an old boot the fw version really doesn't matter (unless it's on 5.0.1 bc Ultrasn0w - the unlock tool - isn't compatible on it unless some manual SSH work is done). 5.0 is okay.

    (should I provide a link to this quote? - Little-Acorn)
    It sounds like if I am to have any hope of using a 3GS on T-Mobile with a working GPS chip, I first have to find one that's NOT jailbroken or unlocked, and which has iOS 4.3.3 or earlier, and has baseband 5.13.04 or earlier. I'd guess that a lot of 3GSs that came from the factory with those numbers, have probably been plugged into iTunes by their owners and upgraded, and so don't have those numbers any more. I need to find one that has never been upgraded past those numbers.

    And then, even if I do find a 3GS that still has those older versions of firmware and baseband, there's still no guarantee that I can get it going on T-Mobile and still have the GPS working. Correct?

    Even if I do find an older 3GS that still has those older versions in place, is there any way to get it working with T-Mobile, other than by replacing the baseband with 06.15.00?

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    Correct. The 06.15.00 baseband kills GPS and there's no known way to work around that. You will need a baseband lower than 05.13.04 if you want to use ultrasn0w to unlock. The only other option is to buy one of the SIM interposers (Gevey SIM / Turbo SIM / Rebel SIM / etc.) but these can be illegal depending on the model because some of them require dialing an emergency number in order to establish service.

    It's not true that there's no guarantee -- the software exists to jailbreak and unlock the 3GS without the iPad baseband so long as you have a baseband equal to or lower than 05.13.04, so if you can find a phone that has that baseband, you should be able to unlock and not impact GPS connectivity.

    All the 06.15.00 baseband does is give you a baseband that ultrasn0w can unlock (it does also end up breaking your GPS connectivity too, but for the purpose of this discussion), the actual unlocking is NOT done by the 06.15.00 baseband itself, so don't think that you have to replace the baseband to unlock. You just need to get a version of the baseband that is exploitable, and install ultrasn0w.

    It seems like you're confusing having the 06.15.00 baseband with being unlocked (or being able to unlock in general, which isn't true) and it doesn't seem like you're clear that you will need ultrasn0w installed regardless to complete the unlock. The only reason the 06.15.00 baseband is in the conversation is because it's a baseband that is a newer revision (though it's targeted for the iPad specifically, the baseband chip between the two models is similar enough) than the revision on most NON-unlockable devices, so you can exploit the versioning in order to 'upgrade' the baseband to the 06.15.00, which is susceptible to the ultrasn0w exploit.
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