: Sometimes the communication between the PC and the phone hangs. Perform a Force Restart on your iPhone (e.g., for iPhone 6s, hold Home and Power; for newer models, use the Volume Up/Down and Side button sequence) and try the process again.
You downloaded a so-called "free cracked UnlockTool" from a torrent site. Result: Most cracked versions cannot maintain a valid activation record because they lack server-side authentication. This error is the first sign of a non-functional crack. activation record does not exists unlocktool