If 3uTools stubbornly refuses to request SHSH, abandon it temporarily. Use the gold-standard tool: (part of the Odysseus suite).
Faulty USB cables, ports, or even internal hardware issues (like a failing NAND chip) can interrupt the request. Recommended Fixes 1. Verify iOS Signing Status i--- Unable To Request Shsh 3utools Fix
tsschecker -d [device model] -i [iOS version] -s If 3uTools stubbornly refuses to request SHSH, abandon
Trying to use firmware meant for a different device model (e.g., using an iPad Pro IPSW on an iPad Air) will trigger a request failure. Step-by-Step Fixes 1. Verify iOS Signing Status i--- Unable To Request Shsh 3utools Fix