Hi we have an install where there was 5x US2000 installed. We Adding 1 x US 2000C to the mix, We are not able to see via Victron GX unit any of the other batteries (new is master and old slaves). Older units are in alarm state, now I know this has to do with the Firmware. My question is what version do I need to load and where can I obtain the firmware. Currently running on V2.1.