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Thread: Baseband downgrade on beta's

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    iPhoneaholic Turnamental's Avatar
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    Default Baseband downgrade on beta's
    How come the baseband downgrades going from iOS 5 beta 1,2,or 3 to 4.3.3 on my iPhone 4?

    It goes from 04.11.06 ~ 04.10.01 with no problems...

    But I can't run my phone down to 4.0 to get the 1.59.00 baseband...

    I thought once the baseband goes up, it doesn't come back down.

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    Livin the iPhone Life
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    This is because ios5 is still in beta. Apple is only currently signing firmware 4.3.3 therefore you can still restore to it if on ios 5 beta 1, 2 or 3.

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    According to what I researched on Google, Basebands can't be downgraded after installing the new update. Even though your SHSH Blobs are saved, your Baseband can't be downgraded, only the Firmware can be restored. However, If you preserved your baseband and kept a copy of these Custom IPSW from sn0wbreeze or pwnageTool, then you can downgrade the Firmware without worrying about the baseband.
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    Basebands cant be downgraded but since ios 5 is in beta phase, Apple is currently not signing it and its technically only an update for the developers. The baseband will stay updated once ios 5 is officially released to the public.

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    iPhoneaholic Turnamental's Avatar
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    Well having your SHSH blobs saved is just like Apple signing the firmware isn't it?

    I'm just thinking there's something to this and one of the brainiacs can figure it out.

    Like what doesn't let the baseband downgrade in official ipsw's? It's obviously not in the beta versions.

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    My iPhone is a Part of Me Goof's Avatar
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    Quote Originally Posted by Turnamental View Post
    Well having your SHSH blobs saved is just like Apple signing the firmware isn't it?

    I'm just thinking there's something to this and one of the brainiacs can figure it out.

    Like what doesn't let the baseband downgrade in official ipsw's? It's obviously not in the beta versions.
    Apple has to sign every restore you do, Apple doesn't sign a lower version if you downgrade.

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    iPhoneaholic Turnamental's Avatar
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    They don't sign my downgrade if I'm using tiny umbrella and running the TSS server. What's in Apple's signature that allows basebands to be downgraded from betas?

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    From what I've read, the baseband can be downgraded if Apple signs it, but it's a stricter type of signature of which a replay attack (as is used with SHSH blobs) will not work.
    Talk:XMM 6180 - The iPhone Wiki

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  11. #10
    iPhoneaholic Turnamental's Avatar
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    Quote Originally Posted by GnatGoSplat View Post
    From what I've read, the baseband can be downgraded if Apple signs it, but it's a stricter type of signature of which a replay attack (as is used with SHSH blobs) will not work.
    Thank you! THAT answers my ?
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