How do I restore the original mbr?

I mess my mbr trying to install grub2, now I want to get back to the FreeBSD original mbr without the bootmanager.

When I do
Code:
fdisk -B -b /boot/boot0 ad0

I end up with a non functional bootmanager.
 
boot0 is the boot manager. The non-interactive one is (AFAIR), /boot/mbr, which is the default:
# fdisk -B ad0
 
Make sure the correct partition or slice is marked active.
 
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