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Discuss Baseband Chip Question at the Hardware - Hackint0sh.org; Hi, I have an iPhone 4 with a Non-Unlockable Baseband, If I swapped the baseband ...
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    Default Baseband Chip Question

    Hi,

    I have an iPhone 4 with a Non-Unlockable Baseband, If I swapped the baseband chip with a chip from another iphone which has an older version baseband which can be unlocked, will this work? I have an infrared workstation which can physically replace the chips but I wasn't sure if it would work, if they are married to the handsets or pose other problems etc.

    If anyone has knowledge/experience with this kinda thing, please let me know.

    Thanks



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    Quote Originally Posted by aaronmarsh632 View Post
    I have an iPhone 4 with a Non-Unlockable Baseband, If I swapped the baseband chip with a chip from another iphone which has an older version baseband which can be unlocked, will this work? I have an infrared workstation which can physically replace the chips but I wasn't sure if it would work, if they are married to the handsets or pose other problems etc.

    If anyone has knowledge/experience with this kinda thing, please let me know.
    Some of the configuration is encrypted in such a way that it is as you put it "married to the handset". Hackers in Asia (Vietnam, Philippines) have tried this with older iOS devices (their solution was to removing the chip, selectively reflashing only part of the chip (to avoid overwriting the handset specific data) and then resoldering the chip)
    However Apple has made several changes in the iPhone 4 that prevent this approach from working on that device.

    Changes include:

    Baseband and config is now stored on NAND chip instead of separate NOR. This is primarily a cost saving mechanism, but adds some more complexity to accessing and rewriting the required data.
    No public baseband bootloader exploits exist for this device. This prevents the most common technique used for downgrading baseband on the 3G/3GS.
    Last edited by Olethros; 09-08-2011 at 11:14 AM.
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