The error in 3uTools (often occurring at 9% of the flashing process) typically happens when the software cannot verify the digital signature (SHSH blob) required to install a specific iOS version . Primary Solutions
Network interference is a frequent culprit. 3utools Error Unable To Request Shsh
You can only flash iOS versions that are currently "signed" by Apple. In 3uTools, go to the Flash & JB tab. "Unable to Request SHSH" The error in 3uTools
Have you tried a different USB port or MFi-certified cable? To help you get the right fix, could you tell me: What model of iPhone are you using? Which iOS version are you trying to install? Are you trying to upgrade, downgrade, or just jailbreak ? or just jailbreak ?