Instead of the standard restore, try using 3uTools' specialized flashing modes. Some users have reported success with the "Smart Flash" or "Easy Flash" features, which can handle SHSH requests differently.
Skip using public Wi-Fi networks or company internet connections that filter background traffic. Hook your PC up to a direct mobile hotspot connection instead to ensure unblocked data access. 3. Clear 3uTools Cache and Update how to fix error unable to request shsh on 3utools when top
Ensure your device and iOS version are supported by 3uTools. Compatibility issues can lead to various errors. Instead of the standard restore, try using 3uTools'
On rare occasions, your computer's hosts file might be redirecting Apple's verification servers. Instead of the standard restore
Because the tool must ping external authentication servers, any network lag, firewall block, or DNS misconfiguration will drop the SHSH request.