Please note that the only way to downgrade from 7.0 back to 6.3 is re-installation of 6.3 version. So if you have a room, it would be better to install the new version on another server and test before upgrading the existing 6.3 server. I had an issue for drawing map using LLDP on OneView and it was fixed in the latest version of 6.3.0.182 and 7.0.2.33.