Was the RMM3 installed before you updated the FW?
(RMM3 has FW which is updated with the BMC FW)
Have you closed and re-opened the web browser to the RMM3, then reopened the remote session?
(Session may have timed out and needs to be reopened)
What is the RMM3 and mother boards part number?
(Full production or pre-production hardware)