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I have an iPhone 13 pro. When I first got it I would take amazing night mode pictures, but ever since I updated it to IOS 15.2. My night mode quit working. My daughter has an iPhone 12 Pro and hers takes better night mode then mine.
iPhone 13 Pro
You may have developed a hardware problem coincidental with the update but it could be a corrupted update.
First try a forced restart
https://support.apple.com/en-gb/guide/iphone/iph8903c3ee6/ios
If that does not help the  next procedure would be to backup then restore your device to factory, and setup the device without restoring a backup, to see if the issue is replicated.Â
Then restore the backup.Â
If you need to send the phone in for repair then backing up and restoring to factory would be needed anyway.
Here is a guide for those steps
Backup and restore (I recommend the computer method if you have one)
(1)How to back up your iPhone, iPad, and iPod touch – Apple Support
Remove SIM PIN if you have set one
(2) Restore your iPhone, iPad, or iPod to factory settings – Apple Support
Set up as new from the Hello Screen without restoring backup. Test if the problem still exists
If the problem goes away in the newly set up phone then suspect settings or apps.
If the problem remains then arrange a repair including details of these tests.
https://support.apple.com/iphone/repair/service
(3) When your phone comes back or if the fault went away on restoring,  Restore your iPhone, iPad, or iPod touch from a backup
You may have developed a hardware problem coincidental with the update but it could be a corrupted update.
First try a forced restart
https://support.apple.com/en-gb/guide/iphone/iph8903c3ee6/ios
If that does not help the  next procedure would be to backup then restore your device to factory, and setup the device without restoring a backup, to see if the issue is replicated.Â
Then restore the backup.Â
If you need to send the phone in for repair then backing up and restoring to factory would be needed anyway.
Here is a guide for those steps
Backup and restore (I recommend the computer method if you have one)
(1)How to back up your iPhone, iPad, and iPod touch – Apple Support
Remove SIM PIN if you have set one
(2) Restore your iPhone, iPad, or iPod to factory settings – Apple Support
Set up as new from the Hello Screen without restoring backup. Test if the problem still exists
If the problem goes away in the newly set up phone then suspect settings or apps.
If the problem remains then arrange a repair including details of these tests.
https://support.apple.com/iphone/repair/service
(3) When your phone comes back or if the fault went away on restoring,  Restore your iPhone, iPad, or iPod touch from a backup
Camera night mode
