Need steps for netbackup upgrade from 7.1.0.8 to 7.5.0.6 on Appliance 5220

Need steps for netbackup upgrade from 7.1.0.8 to 7.5.0.6 on Appliance 5220

#uname -a

Linux <hostname> 2.6.16.60-0.85.1-smp-wan_2.0.4 #7 SMP Tue Nov 22 19:22:45 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
 

what should be the appliance os version for 7506

what should be OST version for 7506

Thanks