Sun fire 4270 reset BIOS settings after reboot

Hello,

I am trying to perform Suse 10 SP3 installation via network in 6 Sun Fire 4270 M2 servers.

The problem is that even if i set first prio boot device the hard disk the system always try to boot from network.And after the first restart the BIOS setting has been lost(and PXE come first ptio boot device as the default settings)...
Have you ever met a similar situaton?
Thanks in advance for any help.

can you disable the network ports in the boot order?

Yes,this is what i done as workaround.
After the first reboot i disabled all ports in order to avoid booting from network again.