A few days ago (11-7-21) I posted problems with my 7500 generator which I am still researching but I am also having problems with my Freedom 458 inverter/charger my interior control board is not re-ac...
If you get the same model, all should be easy swap. Polarity is critical for both the 120v and 12v connections or the magic smoke is released. Actual terminals could be slightly different. If access is easy give it a go. Do read the full installation instructions before you start.