Hi, I have a iPhone GS running 3.1.3. I tried to use TinyUmbrella to save the 3.1.3 SHSH blob to Cydia but an error "not possible to sign" popped up. Using the advanced option, however, I was able to save 4.0, 4.01 SHSH blob. Is this real? I did not upgrade my iPhone any version higher than 3.1.3. Can I now "upgrade" to iOS 4.0 or 4.0.1 by running the TSS server?