obp failed in Sunfire 480 server ?

# ./unix.flash-update.SunFire480.sh

Flash Update 2.4: Program and system initialization in progress...

Current System Flash PROM Revision:
-----------------------------------

OBP 4.22.19 2006/09/06 23:48

Available System Flash PROM Revision:

-------------------------------------

OBP 4.30.4.c 2010/09/29 09:42 Sun Fire 4XX

NOTE: The system will be rebooted (reset) after the firmware has been updated.
However, if an error occurs then the system will NOT be rebooted.

Do you wish to update the firmware in the system Flash PROM? yes/no : yes
-- The flash device is write protected!!
Flash Update: Couldn't determine the Flash PROM component type;
        First, check the front panel keyswitch and then I/O Riser jumper J1104.
================

solution:

rsc>showenvironment
Keyswitch position is in Secure mode.
now i want to change in on mode
sun gui manually chaned go to server
now it will show
rsc>showenvironment
Keyswitch position is in On mode.

boot server

# ./unix.flash-update.SunFire480.sh
then obp done successfully