I recently purchased a 2nd hand Inspire1 controller to use as a 2nd controller on my Inspire 1pro. I’ve tried everything to get it to connect, but alas no avail. I am wondering if the firmware on the controller is way out of date and as such won’t talk (the controller was part of a set of parts - essentially everything You get with the Inspire except the Inspire. I guess the previous owner must have binned  it big style or sent it for a swim!)
Anyway, is there any way I can ypdate the firmware in the controller that doesn’t require a connection to the aircraft? Thanks.

Hi, we're sorry for the troubles that it caused. I would recommend checking if the RC that would not connect to your aircraft if it's running the latest firmware, if not, please update the firmware. You may swap the RC as well to see if this specific RC will communicate with your aircraft. You may refer to the video tutorials below. Thank you for your support.