(Signature HaSH blobs) are digital signatures from Apple that allow a specific version of iOS to be installed on a specific device. Apple only signs the latest iOS version for most devices. When you try to restore or downgrade, 3uTools asks Apple’s servers for permission. If Apple refuses (because the version is no longer signed), 3uTools returns the "Unable to request SHSH" error.
to see if it provides a more specific error code (like 3194), which confirms a signing issue. Are you attempting a to a specific version, or just trying to to the latest available software? How to Fix 3uTools 9% ERROR Unable to request SHSH Latest how to fix error unable to request shsh on 3utools when top
Ensure that iTunes is closed on your computer before starting, as it can interfere with the 3uTools connection. 3. Verify Firmware Signing Status (Signature HaSH blobs) are digital signatures from Apple
If 3uTools consistently fails, use the command‑line tool tsschecker : If Apple refuses (because the version is no
Temporary disable Windows Defender or third-party antivirus software that may flag 3uTools as suspicious.