Hi!
You can't copy to the SD card while it is in the camera. You need to use a card reader to copy the .bin file to the SD card, then insert into the camera and turn the camera on, then hit the review button. It should ask if you want to update, so click yes. Be sure you are using an official battery and it is fully charged!
(The above refers to the GH2. If you are using Magic Lantern on a Canon, this won't help!)