Using Arduino Mega for RN4677 BLE Module(3.3V)

I am interfacing arduino mega with RN4677 BLE Module that operates at 3.3V and require ASCII commands. I tried connecting Bi directional Level Shifter between both but i am not getting response from BLE module. Then i tried using 330 ohm resistor

TX(Arduino)--330ohm---RX(RN4677)
RX(Arduino)--330ohm---TX(RN4677)
3.3(Arduino)-------------Vin(RN4677)
Gnd(Arduino)-----------Gnd(RN4677)

This connection works last time i tried but now i am not getting any response. I tried to check if BLE module is not damage by connecting it directly to USB to TTL converter and sending commands using terminal its working perfectly fine. Can anyone recommend me alternative to solve this problem

Rn4677 Datasheet.pdf (467 KB)

RN4677 Commands.pdf (441 KB)