Jeff,
Where you said EMS, I assume you mean the Precision Circuits Power Control System.
The manuals I've read have no mention of a provision to do field updates to the firmware or RV Data Parameters. So my guess is there's no intent by PCS or by Heartland to ever do a field update the firmware, or the RV Data Parameters.
The equipment does have a capability of synchronization if there's ever a mismatch between the 2 halves of the system.
You can read more about the Power Control System in
this folder.