SUN Ultra 24 Solaris 10 cpu panic after BIOS update to v1.6

I have a SUN Ultra 24 Solaris 10, and I updated Tools and Drivers from v1.0 to v1.6

I get these messages:

SunOS Release 5.10 ............
Copyright 1983-2008 Sun ......
Use is subject ......
panic[cpu01]/thread= fff ......23120: cannot mount root path

fffff....
fffff....
......

skipping system dump - no dump device configured
rebooting....

How can I fix it?

Thank you.