Pretty sure that is incorrect. DFU mode or not, a saved blob is needed since Apple is not signing any firmware but the current one.....And you do not need the blobs...
....Basically a factory restore back to 5.0....
You don't have to update to a firmware to save blobs for it. It just saves them for whatever firmware version Apple is currently signing regardless of what you're actually running on the phone. It automatically saved 5.1 for you prior to the signing window closing last month.What I find interesting is that Cydia is telling me I have saved blobs for 5.1, even though I'm on 5.0.1, on both my iPad 2 CDMA and my iPhone. How is that possible that I have blobs for a firmware version I never upgraded to?
Not complaining, just curious. I want to update, but
The SHSH just allows you to get past the eligibility check prior to the restore. It doesn't modify the firmware file (ipsw). I've only used custom firmware when I wanted to preserve my baseband.Pretty sure you have to make your own ipsw file modified by your saved SHSH blob. Is my termniology correct? I restored our iPhone to 5.0.1 back to an un-jailbroken state.