Arduino UNO R3 - DFU mode

Hi everyone, I want do USB keyboard from my Arduino UNO R3 - Atmel. I proceeded by this http://2.bp.blogspot.com/-3NUsmpZn3CU/UjAZu5yS9BI/AAAAAAAADfQ/Xekuk1jNh4Y/s1600/ArduinoUno_R3_Front_450px.jpg .

It is not working. My computer normally see Arduino.

How should I proceed?

Thank you very much.

Nobody know?

Get an Arduino Leonardo or Arduino Micro and use the built-in Keyboard and Mouse functions.

If you want to muck with the firmware of the Arduino UNO USB-to-serial chip you should probably start by investing in an ISP device like the USBasp or USBtinyISP. That will make it easier to upload firmware.