I am able to fsck the partitions, mount wd0a and run installboot.
But when I try to boot, I get these messages:

Automatic boot in progress: starting file system checks.
/dev/wd0a (No such file or directory)Can't stat /dev/wd0a
/dev/wd0a (No such file or directory)Can't stat /dev/wd0a
Can't stat /wd0a: Mo such file or directory
CAN'T CHECK FILE SYSTEM.
/dev/wd0a: UNEXPECTED INCONSISTENCY; RUN fsck_ffs MANUALLY.
Autopatic file system check failed; help!
Enter pathname of shell or RETURN for sh:


Jardar