1. Issue with Lollipop upgrade on Micromax Yureka: Unable to pick calls & display not coming or not showing
2. USB storage connection not functioning & not connecting to computer
3. unable to stop the mobile data when its already connected, when we 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

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?