Got a second controller to go with my X5 but due to the dreadful weather at the moment haven't really touched them but thought I would update my system to the latest firmware version. To update the controllers via the app do you have to turn both the controllers on as you would normally? ie: both linked together slave and master and then run the update? I cant find any info on the dji site for a two controller firmware setup. Thanks and Happy new year to you all!