Apple’s New iPhone 3G & iPod Touch 2G iOS 4 Restriction [jailbreak]

If you have a jailbroken iPhone 3G or iPod Touch 2G, pay attention to this. Apple has introduced a new restriction in iOS 4 where it does a soft check for SHSH blobs on iPhone 3G and iPod Touch 2G as well just like it does on newer devices.

Dev Team has posted an explanation on this new restriction

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.

So, if you noticed that Cydia is storing your SHSH blobs on iPhone 3G or iPod Touch 2G, then you now know why.

{ via Dev Team blog }