An SHSH blob (Signature HaSh) is a digital signature that Apple uses to control which iOS versions can be installed on your device.

Are you trying to to an older iOS version, or just updating/restoring to the latest one? How to Fix 3uTools 9% ERROR Unable to request SHSH Latest

Click and navigate to: C:\Windows\System32\drivers\etc\

Ensure your PC has a stable internet connection without active VPNs or strict firewalls that might block Apple's servers. 5. Advance Manual Verification (sh.host)

For a successful flash, your iPhone typically needs to be in DFU Mode (Device Firmware Update) rather than standard Recovery Mode. An unstable USB connection or incorrect drivers on your PC can also interrupt the communication.