pkg: pkg is not installedBootstrapping pkg from pkg+http://pkg.opnsense.org/FreeBSD:10:armv6/16.7/latest, please wait...pkg: Error fetching http://pkg.opnsense.org/FreeBSD:10:armv6/16.7/latest/Latest/pkg.txz: Not FoundA pre-built version of pkg could not be found for your system.Consider changing PACKAGESITE or installing it from ports: 'ports-mgmt/pkg'.
16.7 is 2.5 years old. Those have been removed a while back from the mirrors.
Perhaps, but I don't believe you'll be able to update as well.So you'd be stuck at that version.