The "Unable to request SHSH" error in 3uTools is almost always a network or caching issue, not a permanent problem with your device. By running 3uTools as administrator, switching DNS to Google (8.8.8.8), disabling firewalls, and using DFU mode, you should resolve the error within minutes.
Before troubleshooting, you must understand one crucial rule: how to fix error unable to request shsh on 3utools when top