My iPhone5s doesn't know why the camera and flashlight are useless. The camera turns on the black screen and the flash doesn't light up. Go to the mobile phone shop.

If 1, the iphone5s camera and its own flashlight cannot be turned on, it is recommended to download the corresponding third-party software for trial use. If the camera and flash function can work normally, it means that the hardware of the machine is fine.

2. You can check whether the corresponding software has the latest version upgrade.

3. If the above two methods fail, if necessary, you can back up important data, enter the settings, restore the factory settings, and let the mobile phone return to the factory state.