Shsh Host __top__ [ PRO ]
No. The only exceptions are OTA delayed signing windows (rare) or tethered downgrades using iBoot exploits (iPhone 4 and earlier).
A helpful paper on focuses on its role as a specialized web-based platform for saving and managing SHSH blobs shsh host
futurerestore -t blob.shsh2 -s sep.im4p -b baseband.bbfw -p BuildManifest.plist target.ipsw shsh host