: Sometimes data transmission errors mimic SHSH request failures. Use an original Apple Lightning/USB-C cable and a USB port directly on the motherboard (for desktops).
If 3uTools continues to fail, try using Apple Devices or iTunes to restore the latest signed version, which often provides more specific error codes if a hardware failure exists. 3utools Error Unable To Request Shsh
Check your computer's "hosts" file (found in C:\Windows\System32\drivers\etc\ ). If there are lines containing "apple.com," delete them, as they may be redirecting the request to the wrong server. : Sometimes data transmission errors mimic SHSH request
You are trying to install an iOS version that Apple has stopped "signing." Once signing ends, Apple's servers will not issue the SHSH blobs required for installation. " delete them