My first quad I bought was a walkera runner 250 basic. It was fun to learn on but leave a lot to be desired. Since then I decided to build my second drone and upgrade my remote to a taranis x9d. I read that I can also modify the walkera to use the frsky x4s reciever however I have to update the firmware to multiwii 2.4 on the flight controller. Can some please help me out and give me some instruction on how to perform the update. I know where I can download the update file but have no idea how to perform the update. Is there a program I have to download also to run the firmware?