Log into assistand 2 and it will show you your options for downgrade. For me, I only have v1.4.0602 for option. My obsidian was originally at v1.04.0703. My obsidian is not currently exibiting the problems reported by other pilots. I did some flight test yesterday. It is either it does not have problems or I am not testing it properly. I just flew it like I would normally fly and get footages I need.