VRM id is 485941.
And I will give you a bit more details after my experiments on the last 2 days.
I have noticed that Dynamic ESS option in VRM Settings menu can appear and disappear after Cerbo reboot, like I rebooted Cerbo - it is absent, after next reboot it can appear, next reboot - disappear again.
In the Saturday morning I changed some settings and rebooted Cerbo dozens of times trying to find a cause. Unfortunately this black box attempts did not lead to a result.
After next reboot at ~noon I decided to postpone this experiments and wait when known issue with DESS will be fixed, I mean this one Cerbo not loading new DESS schedules.
That time Dynamic ESS option was shown in VRM Settings but DESS Status was Inactive.
After issue was fixed and my DESS switched to Status Auto I rebooted Cerbo and Dynamic ESS option disappeared again from VRM Settings menu and DESS Status switched to Inactive. It was Saturday evening, about 17:00 GMT.
And finally I rebooted Cerbo last time on Sunday morning - Dynamic ESS option appeared in VRM Settings after reboot and is shown by now. DESS is in Status Auto and working properly.
However I am almost sure, if I reboot my Cerbo again - it will disappear again with a very high probability.
Why and what is a reason - it is unclear for me, I did not find any connections with settings, including switching ON/OFF my external grid meter in the system (VM-3P75CT).
So, I hope you will find and fix this issue.
I can reboot my Cerbo by your request if it will be required to reproduce it.
Thanks.