$ sysctl machdep.bootmethod
machdep.bootmethod: BIOS
Booted the 15.1 bootonly CD
# gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 vtdb0
Still getting the "unsupported feature" error.
I can import the pool, delete the redacted dataset, and boot the machine, but still: what the heck?
