If the iOS version you are using is unsigned, you cannot bypass this unless you have previously saved custom local SHSH blobs for that exact device. Switch to a signed version instead. 2. Eliminate Network and Firewall Blocks
Check the status of the firmware for your specific device model. how to fix error unable to request shsh on 3utools when top
: Some users on Reddit found that switching from "Easy Flash" to the "iTunes Flash" tab within 3uTools bypasses this specific bug. If the iOS version you are using is
Deep-seated firmware download fragments can corrupt future installations. Navigate to the 3uTools settings configuration menu, locate the download path directory, and wipe out cached junk files before attempting another run. 4. Fix Hardware Connection Vulnerabilities Eliminate Network and Firewall Blocks Check the status
(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.