Dark screen during call by Lumia 535, what can I do?

[Windows Central Question]

dark screen during call by Lumia 535

My new mobile ,Lumia 535 screen remains black during calling.I can't cut off call or keep loud speaker on.

 

[reetrai]

Re: dark screen during call by Lumia 535

You have to update your firmware it as it has been solved in many by new update