Problem after updating to Lollipop


Right off the assembly line
I have a MIcromax Android One Smartphone. Nearly two months ago I received an update to Android 5.1 and I downloaded and installed it. Everything is working fine except Whatsapp is not working when i use my Mobile data. No message is recieved or sent. Whatsapp works smoothly when I connect to a wifi network. Right now Android is updated to 5.1.1
I tried switching off my phone for few hours, reset it, reinstall whatsapp many times but all failed.
I was thinking of reinstalling 5.1 manually but not sure if it would work. ANy suggestions please....
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