User likely trying to save SHSH blobs for an iOS device (downgrade/jailbreak purposes) or restore firmware with 3uTools, but the request step fails due to server, device, or software issues.
If you try to install iOS 16.4 on an iPhone 12 when Apple is only signing iOS 17.2, you will get this error 100% of the time. i unable to request shsh 3utools fix install
3uTools relies on Apple’s core drivers to communicate with Apple’s servers. Outdated or missing drivers often cause "Unable to Request SHSH" errors even when the firmware is signed. User likely trying to save SHSH blobs for
“The ‘Unable to request SHSH’ error in 3uTools’ Fix Install feature is primarily due to Apple’s signing window closure for the target iOS version. Without previously saved SHSH2 blobs matching the device’s ECID, a valid signature cannot be retrieved, making restore impossible unless advanced bootchain exploits are available (none for modern iOS).“ Outdated or missing drivers often cause "Unable to
For further help, you can check official guides on the 3uTools Tutorial Page .