EC800K-CN (AT Command Not working with FTDI)

I am new to Quectel, recently I got EC800K-CN module for my rk3566 android, it works perfectly with android but when I try to use it with arduino by sending at command it does not respond at all.

Is there sth I am missing here?

It perfectly works with sim800L but this EC800K-CN is giving me troubles.

  1. First of all, you need to determine whether the EC800K is powered on and started normally. You need to measure whether VDD_EXT is high;
  2. You can manually debug the PC through USB or UART connection to determine whether it is compatible with Android