Old devices get 'soft' shsh blobs

Discussion in 'Latest Tech News and Rumors' started by bobby681, Jul 19, 2010.

  1. bobby681

    bobby681 Active Member

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    Those of you with jailbroken iPhone3G and ipt2G devices may now have noticed Cydia starting to save your SHSH blobs too, just like it does for iPhone3GS, ipt3G and later devices. That’s because starting with 4.0, Apple started putting a “soft” SHSH blob check in the firmware. The SHSH blob check is very real in the sense that if iTunes can’t get your blobs (because the Apple signing window has closed), the iTunes restore will error out. But it’s “soft” in the sense that those devices can always use redsn0w or PwnageTool to get past the error (the bootroms themselves for those devices don’t require blobs to be in the firmware files, unlike the newer bootroms).

    Furthermore, since the 3.x IPSWs for these devices don’t enforce it, you can always restore to 3.x IPSWs outside of any signing windows.

    So, Cydia is doing this to allow you to continue to use iTunes to restore to 4.x on iPhone3G and ipt2g outside of Apple’s signing window without needing to use redsn0w or PwnageTool to get around Apple’s annoying new restriction.

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  2. omokas

    omokas Member

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    I remember when everyone said "There is no need to backup SHSH on iPod Touch 2G or iPhone 3G since they don't have any SHSH checks"

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  3. badboy.mjk

    badboy.mjk New Member

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  4. TREYisRAD

    TREYisRAD Member

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    Nice find, FP'd.
  5. Naveen121

    Naveen121 Well-Known Member

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    Wow, that's great! You have your SHSH blobs backed up for 3.1.1, 3.1.2, 3.1.3, and 4.0! I only have my 3.1.2 blobs backed up, but it's better than having none and being stuck with a screwy iOS4.

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  6. tech3475

    tech3475 Active Member

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    I thought something like this was happening when I couldn't downgrade to 3.1.3 (which I never used) using the "normal" iTunes based methods.
  7. Shengis14

    Shengis14 Member

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    I get how to use pwnagetool but how do you use redsn0w ?
  8. neonblues

    neonblues New Member

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    i had my shsh blobs backup on my 3g iphone... i have 3.0 firmware... meaning i can now upgrade to 3.1.2 or 3.1.3 without thinking of the apple signing problem? is the upgrade similar to the downgrade tutorials out there?
  9. Shengis14

    Shengis14 Member

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    The soft SHSH check only works on 4.0 FWs so u can change to any 3.x.x FW
  10. Tkf1

    Tkf1 Community Development Staff Member

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    Yes. But I suggest going to 4.0 and jailbreaking with Redsn0w. And if you need an unlock use ultrasn0w.

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