network problem after update in lollypop of Micromax unite 2 I updated my unite 2 4gb  from service Center in Lollypop. After then its problem create no network some time . Then its fixe when I on flight mode and off it or restarting phone. But after some time its also start no network. I reverte back into KitKat by service Center but this issue not solve. Please help me its so frustrating?
Go to Settings > Mobile Networks > Network Operators > Choose Automatically.
Also set your preferred network as '2G'.