Why is the camera on my BLU Vivo XL2 stuck in the selfie mode?

I dropped my phone last week and cracked the screen. I could still use the camera with either the front-facing or back camera and the torch light still worked. I then took the phone to a repair shop for a new screen; I got it back yesterday. Today, when I tried to use the camera to take some pictures, I noticed it was stuck in the selfie mode; the icon to toggle front-back cameras somehow got disabled. I also noticed the torch couldn’t turn on. So, I lost my back camera, which is the main one, and the torch light. I researched online and followed some instructions such as clearing the data and cache before rebooting; that failed. Anyone out there has any hack that I can use to get those functions back? I greatly appreciate.