I'm using a Mac, and using the latest Redsn0w. I have my SHSH saved for 5.0.1 and can successfully download them from Cydia via Tiny Umbrella. I have used Redsn0w to verify the blobs, and the Apticket is also valid. I then choose to stitch the blobs to the 5.0.1 ipsw file and create a custom ipsw, although I don't see this NO_BB ipsw, all I see is a new ipsw with the same name as the blobs file (a series of numbers). I then enter pwned DFU mode, and use the usual method of browsing for an ipsw in iTunes, selecting my custom build ipsw from Redsn0w. The restores gets 3/4 of the way through then tosses me out, giving me iTunes Error 1 and returning me to Recovery Mode and the "Connect To iTunes" screen. Am I missing a step in the custom ipsw build process? I also edited the host file to ensure that the 74 ... etc etc gs.apple was not scored out at the beginning of it's line, thus pointing iTunes to the Saurik servers. All the decent guides I can find on Google for downgrading mention iFaith, but this is Windows only correct? Thanks.