Unless something has changed, then it is too late to do this. I thought you could only save blobs while the firmware was still being signed by apple. Is the current signed firmware for the iPhone 4 not iOS 7.0.6 and not 6.0.x?
Anyone interested might want to research that further before upgrading from iOS 6.
If you are on ios 6.1.3 on iphone 4 now, with ifaith, you can save shsh.
OK. So it's now possible to save the blobs for an older firmware even after apple have stopped signing the firmware? Pretty good breakthrough.
Q. If I have an iphone 4 with no blobs currently saved for iOS 6.0.3 as of March 2014, I can still use faith to get the blobs?
Im just looking for clarification because I gave up saving blobs last year. Back then I could only save blobs when it was the current firmware i.e. when Apple were still signing it.