First thing id do is a hard battery reset….simply disconnect both battery terminals from the battery, with both battery clamps pulled up touch them both together, you may find it wont reach and so use a screwdriver or something metallic to touch them both together. Leave them connected for about 5 minutes and then reconnect to the battery
EDIT: Obviously im not talking about touching the battery posts together but the clamps / power and earth cables that come off of them!!