Recovery
How do I recover deleted text messages and deleted photos?
iPhone 12 Pro Max, iOS 14
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If you had messages in iCloud turned on Keep all your messages in iCloud - Apple Support and those messages were deleted, then they are permanently gone. If that feature wasn't turned on, you can restore from a backup -- Restore your iPhone, iPad, or iPod touch from a backup - Apple Support.
For Photos, you can try - If you're missing photos or videos in the Photos app - Apple Support.