” If the perp used a 4 or 6 digit numeric only password they could potentially crack it fairly fast with govt. super-computer power.”
Only has a 4 digit password. Don’t need a supercomputer.
Even hand entry would take at most a week.
iOS allows you to use a 4 or 6 digit numeric password or an alphanumeric password of up to 37 characters. The “Touch-ID” fingerprint reader on the iPhone 5s or newer lets you use a very long alphanumeric password because you don’t have the inconvenience of entering it in every time, just use the fingerprint reader. Fortunately for the FBI the terrorist was using a government provided iPhone 5c without the fingerprint reader, so he might have been using a short numeric password.
With a rainbow table and a few minutes on an old laptop it could be done. Heck you’d probably only need a few gig of storage for the table (if that) for a 4 digit pass code that is numeric only.