Arduino: 1.6.9 (Windows 7), Board: "Arduino Nano, ATmega328"
Sketch uses 1,888 bytes (6%) of program storage space. Maximum is 30,720 bytes.
Global variables use 188 bytes (9%) of dynamic memory, leaving 1,860 bytes for local variables. Maximum is 2,048 bytes.
avrdude: ser_open(): can't open device "\.\COM27": The system cannot find the file specified.
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
this is what it shows when i'm trying to upload any code to "nano" board. 
I'm just connect an ESP2866 Module to this Board according to the instruction of this site "http://www.teomaragakis.com/hardware/electronics/how-to-connect-an-esp8266-to-an-arduino-uno/"(I also attached the schematic. But it dose not works at all.
Then I try to Update the firmware of ESP module. And it Successfully updated.
And after this my audrino nano goes to coma. .. .
is it completely dead or it can be fixed by updating boot loader or something else????
please help me... 
