Hi all Well it finally hit me at the worst time - I had to go to the genius bar for a repair and they did the 4.0 upgrade. I have blobs stored on saurik's server for everything through 3.1.3. I tried a few things to downgrade to stock 3.1.3 and was finally able to do so after failure with recboot. So now I have stock 3.1.3 and I have my custom 3.1.3 firmware made. Going into DFU or recovery yields error 1604 - on two machines, one running iTunes 9.1 and one running 9.2. Tried with the hosts file redirecting to Saurik's server on 9.2 and to apple's server on 9.1 (haven't tried redirecting on the machine with 9.1 but I guess I'll try that next) I am assuming the issue is the bootloader being updated - is that correct? Is it possible to get back to jb 3.1.3 so I can roll up to 4 with pwnage 4.0 then unlock (not necessary since I am an ATT customer, but preferred)? Any help would be greatly appreciated, I'm not new to jb, but have never been through a forced upgrade then downgrade.. and I can't seem to get it to take.