We've got a 3 year old MultiPlus on our boat, which was installed by rßthe former owner. The device is Firmware version 147. In the VRM it shows me, that it is not upgradeble. Error 1342. Now I tried to do an offline upgrade but even that fails without any error.
What do I need to do, to upgrade the device to version 1909209?
Need to add following details:
- RaspBerryPI 3b+ with VenusOS large 3.31
- MPPT 75/10 v1.64
- Multi Control Device for the Inverter