I have 2 FMC devices in a HA pair. They are currently running 6.1.0.6 and I am looking to update them to 6.4.0 before upgrading them further to the latest release.The 'upgrade readiness check' does not work from the GUI even when the HA is in a pause...

We have the same alert displaying. The system has performed without an issue for the last 2 months with this alert present. Only today did we get some NFE issues, that were resolved by simply rebooting the sensors.However this alert is still present ...