"Nikhil,
You do not need telemetry to fly with this board .The telemetry allows you to have further options such as changing the flight plan in the air ,uploading new perams, ect without having to use the USB cable to connect to your computer.
…"
"Is the green LED on the board still flashing ? or is it on all the time ?. make sure you are arming the system with rudder
command to make the green LED on all the time -not flashing."