I have Arduino UNO R3 Compatible Board ATmega328P ATmega16U2 board. Kindly any one suggest me how can update KK 2.1 firmware use this above Arduino board. I have seen many video but i am confused in command path. Please anyone suggest me how can i update? Please provide easy video , image or URL for that.

Firmware update with Arduino:
For Windows
For Mac

Please check screen short and suggest me.

For kk 2.1 it should be -p m644p This argument specifies the target chip while programming.