You are using an old version of 3uTools or iTunes. Step-by-Step Solutions 1. Check the Signing Status
Troubleshooting 3uTools Error: "Unable to Request SHSH" If you are trying to jailbreak, downgrade, or upgrade your iPhone using 3uTools and hit the error, you aren't alone. This is one of the most common hurdles when managing iOS firmware.
When 3uTools shows "Unable to Request SHSH" it means the tool failed to obtain saved SHSH blobs (Apple’s device-specific firmware signatures) for the target device/firmware. This prevents restoring or downgrading signed firmware using saved blobs. Causes include network problems, server/API changes, device mismatch, unsupported iOS versions, certificate/signing issues, or outdated 3uTools.
In 3uTools, click in the bottom right corner.