After buying my P3S in Nov 2015 I was using my HTC One 5.0.1 witch was about 14 months old and it preformed flawlessly. After a few flights the video became choppy and got worse an worse untill I couldn't even use it. I was informed I could cashe maps on my ipad mini 2 and started using it. So far I love it besides the fact that it may heat up on hot days. I assumed the HTC was just getting old,low memory ect. Getting to my question I had to replace my phone w/ a new one(same model) and was quite happy that I would have a NEW backup device. I go to download the Go app and all of a sudden the phone doesn't support the app. WTF! Are these Firmware updates making older devices obsolete and is my mini2 next? Being able to use your smartphone is what makes this sport affordable to a lot of us!