To change the hostid, usually it's sufficient (and very easy) to use the hid ( or hid2 ) programs, which change the hostid of the running kernel.
On Sun workstations and servers you can interact with the boot EEPROM (NVRAM) at any time by holding down the STOP (L1) key and pressing the "a" key
Do you need to determine which release of Solaris you are running? Or other useful information that comes with it? The read more