Temporarily disable your antivirus software and firewall to ensure that they're not interfering with the SHSH request process.
Wait for the process to finish, restart your computer, and try again. 5. Address Network and Connection Issues
The "Easy Flash" option in 3uTools tries to be smart by saving blobs. It fails silently. I switched to iTunes Flash > Quick Flash Mode . This bypasses the SHSH check entirely and just restores normally.