This is currently happening to my XR currently. I'm pretty sure it's because I had less than 1 gb of storage left. I would've definitely restored it but my phone hasn't been backed up since last year apparently. I don't want to lose my data. It has been at least 36 hours now that my phone has been stuck in a boot loop. I have tried the different button methods, let the phone die a couple of times, and I even went to the Apple store yesterday and they told me I could update the phone but they wanted me to sign some waiver that would say it's not their fault in case my data would be lost which made me hesitant so I just left. Does anyone know if updating the phone could actually result in data loss? I plan to update the phone through iTunes as soon as I can but I just want to make sure.