Out of the box, my AC firmware is 1.4.10 and controller is 1.4.30. I am using latest iOS Go app. Curiously, using an iPad Air2, firmware version showed up as "firmware unknown" but with iPhone 6s I could see the actual versions. I'm not sure why that happened but I figured out that discrepency. Also. the iPad does not show any alerts to update FW (ready to fly) but the iPhone alerts to update FW even though they are both using the same version of the GO app. Can I update directly to latest firmware or do I need to step install each older FW version first? There are mixed comments of what to do when I search here. Also, do you turn the AC off when updating the controller? Thanks for any help.