Hi, 

when i test firmware upgrade 8.5.0.14 from 8.3.1.x, I have this allert:

At least one user has a SSH key configured.
In software level 8.4.0 or higher support for DSA SSH keys has been discontinued.
Please manually check that you are not using DSA keys.
It is also recommended to use keys of 2048 bits or longer.

When I configured PowerHA, I create RSA key, I see this from PowerHA redbook