I've a Multiplus 48/5000/70 with firmware 400. When I connect it with a MK2-USB and the latest version of VEConfigure 3, they retrieve all parameters but if I white new parameters to the inverter, the program stops at init of writing and show me an white error.
If I use an old version of VEConfigure (the version that need the password), is no problem to read/write parameters to the inverter.
The problem is the old version of the firmware?
And, other question: for change the Grid country, i will need a password? What is?