Immutable zones ensure the integrity of the files on the system. The policy of the zone specifies which files can be modified. If you have access to a terminal window in the global zone, you can change the zone to mutable, administer, then return the zone to immutable. Use the zlogin -U or zoneadm command, see Administering an Immutable Zone by Making It Writable in Creating and Using Oracle Solaris Zones and the mwac(5) man page.