ESP8266 NodeMCU v1.0: no response on USB-serial connection

[Erik84750]

Using USB-serial board with FTDI connection and AccessPort ( http://www.usconverters.com/index.php?m ... &chapter=0 ) monitor no response on AT commands is achieved. The serial board is tested with loopback connection and performs ok.
Connections:
1. 3V3 connected to serial board 3.3V
2. GND connected to serial board GND
3. TX to serial board RX
4. RX to serial board TX
5. EN pin is 3.3V

Only when RST button is pressed is the following result received on the monitor (74880baud):

ets Jan 8 2013,rst
cause:2, boot mode:(3,6)

load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v4022eaa8
~ld

No response to AT commands.

What can be the issue?

[pratik]

You should probably update the firmware on ESP8266 module that you are using.
Also, please use a 3.3V USB-UART converter. 5V can damage the ESP8266!