Loop Back Test Failed

Development Tools IDE 1.x
1

My Problem:

I am having an arduino nano , it worked fine initially where i was able to upload code into the nano , it all worked fine. I was trying to flash my esp8266 with a suitable firmware for it to respond towards AT commands , i used my arduino nano as a FTDI to serial convertor to flash the esp8266.
It is from that time my arduino stopped accepting codes , whenever i hit the upload button , the code first compiles successfully , then stays in the uploading part itself.
After long time it says "An error occurred while uploading the sketch"... I am not able to resolve this problem..

Thing i have tried:

  1. I have tried this loopback test where the serial monitor does not give any output when i send something (doesn't echo back)

  2. Reinstalled the arduino IDE

  3. Tried with a different computer (no changes -stays in the uploading part itself)

  4. Tried connecting the arduino with a different COM port and also tried with a different cable

I am not able to figure out what may be the issue , have i destroyed the bootloader ??
Someone please help me with this problem..

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2

Go to settings and check "show verbose output during upload", try again, and post the output here.

Using the serial adapter on a nano as a serial adapter should not damage the board (however, you can buy standalone serial adapters for like a buck and change shipped - it's not much of an investment, and they make life a lot easier).