Solved Error loading operating system

[balanga]

No, really no need to do that. Also -- beware -- you are using wrong -b file:

It has to be -b /boot/pmbr.
Nothing else needs to be fixed on that setup, just that bootcode.

OMG I can't believe I ran gpart bootcode -b /boot/mbr -p /boot/gptboot -i 1 daX

Note to self make sure you run

gpart bootcode -b /boot/pmbr -p /boot/gptboot -i 1 daX

Looks like I had a typo in an old script somewhere...

Apologies to everyone for wasting your time..