Catalog recovery error

Hi Team,

 Upgraded Netbackup master server from 7.1.0.3 to 7.5 and took catalog backup before migration.

Now due to certain reasons after five days, downgraded master server from 7.5 to 7.1.0.3 but catalog backup is failing with segmentation fault.

Recovered the catalog with catalog backup taken before upgradation 7.5.

Please let me know how to recover catalog in netbackup 7.1.0.3 taken from 7.5.

Below are details:

Netbackup server : previously 7.5 and now 7.1.0.3 

Os Solaris 10.