Major issues on Micromax YUREKA after updating to Lollipop

Question

I am having multiple issues on my Micromax Yureka after upgrading to Lollipop:

1. I am unable to pick up calls & the display is not coming on
2. USB storage connection is not functioning & won't connect to the computer
3. Unable to stop the mobile data when it's already connected, when I click the data option, it's going the open the data usage details only.
4. Rear camera flash not properly functioning, it's not timely flashing.

How can I fix the issues?

Answer 1

1. Go to Dialpad.
2. Dial *#*#7769#*#*
3. A proximity sensor calibration window will pop up.
4. Press “Start”
5. The sensor will be automatically calibrated, a message will appear “ Calibration Good”