Hello. I have a Max E 11 kW inverter. The Main CPU version is 73.06 and the Secondary CPU version is 12.21. My issue is as follows: When I supply power to the device from a stable AC grid, it works properly. However, when I supply power from a generator, the system does not switch to or accept the AC input. I believe this is due to voltage fluctuations from the generator. Which firmware / CPU version would solve this issue?