The Iphone Dev team reported on their blog that with iOS 4 and iOS 4.0.1. Apple has started a soft SHSH blob check for 3G and ipod touch 2nd generation, this means if the singing windows is closed while restoring, iTune gives error.
But dont worry folks cydia is now saving SHSH for both iphone 3G and ipod toch 2nd generation so you can restore when you want, according to DevTeam as this is a soft SHSH blob check it can be easily bypassed by redsn0w or PwnageTool.
“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.”
[Via DevTeam]
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