IMU firmware uplading using Arduino

I have a 9DOF Razor IMU, and I wanted to upload a modified firmware on it using Arduino IDE. It works once and gives error when I try to do it again. It worked once yesterday and today, but after that it gave error.

non-verbose error:

Sketch uses 63736 bytes (24%) of program storage space. Maximum is 262144 bytes.

No device found on ttyACM0

An error occurred while uploading the sketch

verbose error:

No device found on ttyACM0

Set binary mode

readWord(addr=0)=0x31312e30

readWord(addr=0xe000ed00)=0x302d202c

readWord(addr=0x400e0740)=0x2c33322e

version()= -0.91, 0.85, 1.10, -0.61, 37.96, -1.95, -23.71

chipId=0x2c33322e

Unsupported processor

Send auto-baud

Set binary mode

readWord(addr=0)=0x302d202c

readWord(addr=0xe000ed00)=0x2c33322e

An error occurred while uploading the sketch

readWord(addr=0x400e0740)=0x2e302d20

version()=91, 0.91, 1.10, -0.67, 37.96, -2.25, -23.71

chipId=0x2e302d20

Unsupported processor

I looked it up on-line i didn’t find anything that matched except for the Arduino boards.