ever since i got my first iphone 3s i always had the internal ios software turned off so i t cant download. now i noticed my phone was running like ****, and battery drain, looked and the sofware is downloading. i paused it and thought that would be the end, but it finished downloading and now wants me to install. How was it even possible for it to start downloading? so weird. is there any way to delete it? i don't want ios 9 on my 5s.