Why can't the flash of mobile phone camera be turned on?

I suggest you: 1. Applications-Camera-Settings (Pinion icon)-Reset, and then turn on the flash. 2. Check whether the mobile phone is equipped with third-party software similar to a flashlight. I suggest you uninstall it and check whether the phone is back to normal. 3. Check whether the battery is fully charged. 4. Back up mobile phone data (phone book, SMS, multimedia materials, etc.). ) and try to restore the phone to factory settings (Settings-Reset-Restore Factory Settings). If the problem still exists, it is recommended that you bring the purchase certificate of three guarantees.