Check for Apple server reachability
In the 3uTools Flash & JB tab, select iTunes Flash instead of "Easy Flash". This uses the standard Apple communication protocol, which is often more reliable for new devices. Advanced Troubleshooting how to fix error unable to request shsh on 3utools when new
Ensure your computer's date and time are correct. Apple verifies SHSH blobs based on the current date and time. Check for Apple server reachability In the 3uTools