Today i tried installing a new cerbo Gx to a older multiplus. Multiplus firmware updated along with the cerbo.
I shut down both inverter DC and AC. Connected a new a RJ45 to both inverter and cerbo. Powered it up and the multiplus would not show up on the devise list. The only devise that showed up was the BMV through a V.E. direct.
The solution was to unplug the power at the cerbo GX then turn on the inverter. Once the multi was up and running i would plug the power cable up then i worked perfectly. I found thisout by pure luck. Just thought this post would help someone.
Ps
I also tried to reboot the cerbo, that didnt help.