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Use command-line tsschecker (from tihmstar). Run: tsschecker -m BuildManifest.plist -d <DeviceID> -e <ECID> -s If external request also fails → Apple signing issue or network block.
This is the most common cause. If you are trying to restore to an older iOS version (such as iOS 9.3.5 or 9.3.6) that Apple has stopped signing, 3uTools will inevitably fail at the point when it tries to request SHSH from Apple's servers. For instance, older versions of iOS for devices like the iPhone 4s are often listed in red in 3uTools, indicating that they are unsigned and cannot be flashed in the standard way. error unable to request shsh 3utools 9 updated
Look at the firmware list. Versions highlighted in are currently signed and can be flashed freely. Versions in Red are unsigned. Use command-line tsschecker (from tihmstar)
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Register for our next live class, Tell it All, August 3rd