Apple stops signing older iOS versions within weeks of releasing a new one. Once a version is "unsigned," Apple’s servers refuse to generate SHSH blobs for it.
TSSchecker is lightweight and ignores many of the GUI-related network timeouts that plague 3uTools. i--- Unable To Request Shsh 3utools Fix
Using an older version of 3uTools that does not support newer device models or has known bugs with the latest iOS builds. Hardware Conflicts: Apple stops signing older iOS versions within weeks
If you are currently staring at this error code, you are not alone. This issue typically arises when users attempt to save SHSH2 blobs for future downgrades or jailbreak purposes. The error can stem from server-side issues, network configurations, or specific setting adjustments within the software. Using an older version of 3uTools that does
3uTools attempts to request these blobs from Apple (or from local caches like Cydia or TSS Saver). When you see "Unable to Request SHSH," it means: