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Discuss [All Firmware] Should we go from 4.6 to 3.9??? at the iPhone "2G" (Rev. 1) - Hackint0sh.org; Originally Posted by garylin The side effect of using ziphone 2.2 to fully unlock 1.1.3 ...
  1. #41
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    Quote Originally Posted by garylin View Post
    The side effect of using ziphone 2.2 to fully unlock 1.1.3 OTB is that the bootloader gets downgraded to 3.9 automatically in order for 4.03 BB to work with 1.1.3 firmware. (which take about 2 to 5 min. to unlock. very very easy).
    ziphone 2.2 does not automatically downgrade your bootloader on OTB 1.1.3 unless you run the clickhereX4.6.bat

    if you run the clickhereX4.6.bat, it does ziphone -v -b -a -j . YES this downgrade bootloader

    if you run the clickhereX3.9.bat, it does ziphone -v -u -a -j. Just unlock.

    So, if you run the bat file, make sure it is what you want.

    Best is to do it manually and the -j -a -u works on both BL without touching the BL. Also -v is default.


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    @dtube

    Thanks for pointing this out. As most newbies would probably run the 4.6 batch file without understanding why and how.

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    Why don't you just use the GUI.

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    I have checks in the program to prevent a bootloader without the bootrom locations blank from being uploaded

    -geohot
    Correct me if I am wrong, but with the bootrom locations blank, uploading another BL is trivial. This is the whole point of the A17 hack -- to fool the bootrom into thinking these are blank. Only native BL3.9 cannot be upgraded as I understand... the BL4.6 who downgraded to BL3.9 (and have bootrom locations blank) should be upgradable with the tools we have now.

    Unless I'm missing something.

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    This is the A17 hack ..

    The hardware for the iPhone unlocker is a simple test point pulling the
    NOR flash address line A17 to high basically fooling the bootloader
    checksum calculator into thinking that the baseband flash is blank
    (0xFFFFFFFF), therefore allowing the bbupdater to execute unsigned code which in turn loads the baseband flash (0x20000-0x304000) with the patched NCK disabled mod (04 00 a0 e1 -> 00 00 a0 e3)

    So according to this, the A17 hack is to allow bbupdater to run & load the baseband flash with patched NCK. Nothing about downgrading the bootloader.

    Am I missing something?


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    "the BL4.6 who downgraded to BL3.9 (and have bootrom locations blank) should be upgradable with the tools we have now."

    I think what you said above is the result of a hardware unlock.

    The downgrade using ziphone only uses native 3.9BL per Zibri.

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    Quote Originally Posted by AdamSnow View Post
    All 1.1.1 and below came with 3.9, and aren't upgraded by Apple correct?

    Apple still has to support the older phones, and will make everything work with those as well as the 4.6 BL...

    If 4.6 was that great, and required for the future Apple would have all the phones upgraded to that BL with an update.

    I've taken 2 down to 3.9 already, and have zero regrets.
    This is the most coherent argument as to why you should move back to 3.9, but as I see it it's flawed. Apple were quite happy to leave all the old users 'out in the rain' when intel processors became the way forward, why in theory, could this not happen with 3.9?

    To add weight to the argument. From a business point of view I'd be pretty upset with the simplicity of the new unlock and you can bet ATT / O2 etal are jumping up and down at there loss of exclusivity - at which point perhaps apple will try to make sure all those on 3.9 are stuffed. With the idea that if there is a 'legitimate' 3.9 customer they can go back to the store and have there phone upgraded to the latest firmware.

    Perhaps my reasoning says more about me than apple though...

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    I think the "A17 pull-up" fools the bootrom into thinking the bootrom locations are blank, but if they actually are blank, there is no need for the A17 hack and software bootloader upgrade is possible.

    See: http://iphone-dev.org/sgold_bootrom:checkblank

    Then again, I'm out of my area of expertise. Maybe geohot can comment?

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    Quote Originally Posted by garylin View Post
    The downgrade using ziphone only uses native 3.9BL per Zibri.
    This could be correct but only if Zibri patched out the "bootrom blank" checks that geohot implemented. Zibri, can you comment? In the ZI BL downgrade, are the bootroom locations still blank as geohot intended?

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    Quote Originally Posted by NENO View Post
    To add weight to the argument. From a business point of view I'd be pretty upset with the simplicity of the new unlock and you can bet ATT / O2 etal are jumping up and down at there loss of exclusivity - at which point perhaps apple will try to make sure all those on 3.9 are stuffed. With the idea that if there is a 'legitimate' 3.9 customer they can go back to the store and have there phone upgraded to the latest firmware.
    If they can do the upgrade of the BL in the store, it can be done by Geo as well!

    cu/

    Sergeij


 

 

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