I'm on 4.2.1 and jailbroken. I want to go 'legit' and upgrade to 5.0 - start from scratch. When I do this without TinyUmbrella running, I get a phone is not eligible error msg. When I run the TSS server from TinyUmbrella I get the 1604 error message. Latest iTunes 10.5, latest Lion build. Both with the iTunes downloaded 5.0 and a direct download .ipsw file. I've also tried various versions of advanced settings that TinyUmbrella recommends. I have all my shsh blobs backed up there and on Cydia. It gets past the verifying stage and halts on the preparing stage with the 1604 msg. I've checked my hosts file and it looks ok - nothing changed since I edited it way back when, and I understand tiny umbrella does their own thing as well. I just want to completely throw this puppy back into factory style mode to run 5.0. All help is appreciated.