Hello! I have a multiplus with ve.bus bms and 3 90Ah victron batteries on the bms. I would like to upgrade the multiplus firmware. If I start victron Connect it asks me to disconnect all accessories from the mulitplus before connection to save the config before i upgrade. But when I disconnect the ve.bus rj45 cable to the controller and ve.bus i can no longer turn on my multiplus to connect to it? hints?