Do not upgrade to FortiADC 6.2.1/6.2.0/6.1.4 if you are currently using SAML. Once upgraded, SAML will fail to function. A solution to this issue is currently in development and will be available in the next release.

Before downgrading from 6.2.1, ensure the new L7 TCP or L7 UDP application profiles are deleted or changed to a profile type that is supported in the downgrade version. Otherwise, this will cause the cmdb to crash.