/usr/sbin/sys-unconfig
Back in the day when I was cloning E10K domains running Solaris 2.6/7/8 and JET wasn't around I had to use a combo of
1) ufsdump over NFS to the SSP
2) transfer the ufsdmp to the new SSP/E10K
3) jumpstart interactive the newly prep'd E10K
4) ufsrestore via NFS the ufsdump
5) THEN to get round all things network and /dev - do ...
5a) run/usr/sbin/sys-unconfig
5b) rm /etc/path_to_inst
6) boot the domain OK> boot -arv
and hey presto the domain booted 'as a fresh install' and rebuilt it's device tree
In modern times - when cloning ESX hosted VM's I still use the '/usr/sbin/sys-unconfig' ...
It does exactly what is says on the tin.