Pre-requisite:
1. Oracle recommends that you back up the Middleware Home, the Management Repository, Central inventory, Software library, Management Agent.
2. The minimum version supported for upgrading to EM 13.5 is 13.3. If the OMS is at 12.1.0.x, 13.1 or 13.2, it is mandatory that it is first upgraded to 13.3.0.0.0 or 13.4.0.0.0.
