How can I update my iPhone 6?
Update my iPhone 6 iOS
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Assuming a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support
If the above Apple article doesn’t help, please post back with relevant information.
NOTE: The iPhone 6 can be updated to iOS 12.5.5, no further.
Also note: Selfies are not required to update a device, or post a question here.