Hi. Neither my flashlight nor my camera isn’t working. It works only for selfies. Just updated my phone but still facing same issue. Please help

Try the Related Article

If the camera or flash on your iPhone, iPad, or iPod touch isn't working

After that arrange a “repair”

https://support.apple.com/iphone/repair/service

Anything other than Screen or Battery may be a replacement phone and the price is in the article, depending on your warranty or AppleCare+ status.

On an iPhone X or later or an iPad, swipe down from the upper-right corner of the screen. ... If the LED flash doesn't work as a flashlight, contact Apple Support for help with your iPhone, iPad, or iPod touch. If the flash works only sometimes, open the Camera app and tap the flash button to choose a different setting.

If the camera or flash on your iPhone, iPad, or iPod touch isn't ...