front facing option not available in camera of lumia 540

[Vrinda Bharara]

When initially i bought this device ....front camera worked properly, also the option was available that helps to switch between front and back camera was there and it worked very well but suddenly it disappeared and whenver i open selfie camera it shows me the view of back side camera and not mine. This problem started itself when i had windows 8.1 which came by default with this device, even i tried resetting the device twice but nothing happened. Then I thought maybe because of phone update it might not be working...so i updated my phone to windows 10 and now still that option of "front facing" that should come is not there only. In this case what should i do? Does microsoft has know disappeared the option of taking selfies inspite of the app "lumia selfie" working like any of the other back camera.