Yesterday I bought a used but working P3S remote controller at a yard sale. The aircraft it belonged to was lost some time ago. Included was the original retail box for the aircraft along with the black prop sock and battery charger. At 5 bucks, it was a a very good deal that I could not pass on. My current P3S remote is heavily modified and having a stock spare RC will be nice. Linked the used RC to my P3S using the S2 + gimbal dial /link button method and it flew my aircraft nicely and there's no prompt given by the GO app suggesting a firmware upgrade needed but I want to be sure about this remote's firmware version. How do I find what FW version is currently installed on the yard sale remote controller?