If you're trying to to an unsigned version, you cannot do so without previously saved SHSH blobs.
Then reconnect your iDevice, let 3uTools re-detect it, and retry the SHSH request. 3utools error unable to request shsh hot
But he didn't have luck.
(Signature HaSH blobs). This is a unique digital signature that proves the firmware you are trying to install is currently "signed" or authorized by Apple for your specific hardware. The Breakdown: If you're trying to to an unsigned version,
: If the device is stuck at 9% with this error, try putting it into DFU mode instead of Recovery mode before starting the flash. (Signature HaSH blobs)
[e.g., Issue persists only for unsigned versions; resolves on signed versions.]
: Older versions often trigger this error (similar to iTunes Error 3503). Use the official 3uTools website to download the latest version or click "Check Update" in the app.