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What are some reasons an iPhone camera flash wouldn't function, and how can I fix it?
No, I haven't tried that yet. How do I do that?
To reset your iPhone's settings, go to Settings > General > Reset > Reset All Settings. Keep in mind that this will erase all of your customized settings, such as your wallpaper and ringtone, but it will not delete any of your personal data, like your contacts or photos. To restore your iPhone to factory settings, go to Settings > General > Reset > Erase All Content and Settings. This will erase all of your personal data, including your contacts, photos, and apps, so be sure to back up your device before doing so.