IPhone needs to cool down before using flash?

My iPhone 5s isn't overheated, if anything it's cold! Please help this so frustrating not being able to use back camera

My back camera works fine.

You don't know if the phone is cold in the inside. It might be getting overheated in the inside. This might be a firmware or hardware issue but it's surely about overheating. Did you replace the battery of the phone recently? Here are few possible solutions:

- Try factory resetting the phone.
- If you've replaced the battery or anything inside recently, check all the connections are tight.
- If you have a case on the phone, remove that and try after some time.
- Turn off GPS for the camera and see.
- Turn off the phone for some time and then turn it on.

If still the problem persists, you need to replace the phone.

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