How can I fix flashlight and camera issues on my iPhone 12 Pro?

“after update my back camera not working I don’t know why ?”

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Troubleshooting Camera Issue After an Update:

A. First, Go Here: If the Camera or Flash on your iPhone, iPad, or iPod touch isn't Working - Apple Support

B. Uncover the Camera:

Is there anything covering the camera? If so, remove it.

C. Any Ungenuine Camera Message?:

Did you recently get the camera replaced? If so, contact the person(s) who performed the replacement, and have them place a genuine camera in there.See Here: About Genuine iPhone Cameras - Apple Support.  They should have known better.

D. Get this Diagnosed by Apple:

Apple might fix it free of charge, if found to be be faulty device. Set up a Genius Bar Appointment at your local Apple Store. There, it will be looked at and you'll be provided with your options.

C. Report this to Apple.

Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come. Apple will know nothing of you occurrences, if you don't report it to them.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all began after installing an update. Include the URL of this thread
4. Proceed from there as necessary

“Camera and flashlight issues: How I fix iso 18 update camera and flashlight issue”

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What issues are you having? Without that, you’re not going to get the answer you need.