Roll back to previous version -Netbackup APpliance

Geeks !

We have 4 appliances running on 7.6.0.2 ( 2.6.0.2). Now our master server on which we have to add these as media is on 7.5.0.6 and we cannot upgrade it for some time.

How do we roll back to 2.5.0.3 on these appliances.

Thanks,

PranavB