I’m posting this only because the process has changed a bit since I did it back in the days. Because I’m not using Solaris on SPARC, there’s no STOP-A, boot -s, etc.
Just like back in the days with Solaris 8, you would need to boot with a cdrom or PXE or jumpstart, whatever method you have. Afterwards, you take the shell option. Obviously, you’re not installing the OS.
Solaris 11 uses ZFS, not UFS so you can’t directly mount a partition. You need import a pool instead.
mkdir /b zpool import -f -R /a rpool zfs set mountpoint=legacy rpool/ROOT/solaris mount -F zfs rpool/ROOT/solaris /b vi /b/etc/shadow
Edit the shadow file
Find your username and remove the password hash
Change your user id
Then we will need to allow empty passwords at login
$ vi /b/etc/default/login
Change the line:
umount /b zfs set mountpoint=/ rpool/ROOT/solaris zpool export rpool init 6
When the system boots, you should be able to log in as root and just press return for the password. If you’re logging in through SSH, you won’t need to enter a password.
Hope this saved you some time!