My iphone 6 is on 10.3.3, and due to numerous reports of slowdowns, car blue tooth issues, etc I'd rather not update right now. I've been through many of the battery replacement threads and have not seen any reports on whether Apple will refuse the repair if the phone isn't updated, so I'm asking here for any experiences. I realize there are major security reasons to update, but I'm still considering the pros and cons and would rather decide for myself instead of being forced to update to get a new battery.