Finally I found correct way to do that :)
To be clear I will start from beginning
1. Power off device
2. Press Volume DOWN + Power buttons for 3 to 5 sec then release Volume DOWN and then Power
3. Now select Recovery. Android with /!\ will be ...
My phone shows this !!
Similar thread is here
I don't have airtel sim but my room mate have.
Just activated it thanks :p
Memory leak/bug is still there :( Oh god why :(
can you check if the usb otg bug is still there?