To use shsh.host, you generally need your device's (found in iTunes/Finder by clicking the serial number) and its Model Identifier (e.g., iPhone13,3). Other common tools in this space include: How to downgrade from iOS 15 to iOS 14 - GitHub Gist
shsh.host cannot save blobs for a version that Apple has already stopped signing. shsh host
An SHSH host typically works as follows: To use shsh
You can find this in iTunes or Finder by clicking on your device serial number. It helps in ensuring that the software on
futurerestore --set-nonce 0x1111111111111111
Instead of your device talking directly to Apple's gs.apple.com (the official signature server), you modify your computer's hosts file to redirect that request to a custom SHSH host—like Saurik’s server—which stores previously saved SHSH blobs. When the request hits this custom host, it looks up your device's ECID. If it finds a valid, saved SHSH blob for the firmware you want, it provides that signature, effectively tricking the restore process into thinking Apple approved it.
It helps in ensuring that the software on an iOS device is genuine and has not been altered or tampered with. This is crucial for maintaining the security of the device and protecting user data.