I am new with AVR, I have a lot of newb problems (switching from PIC and T.I. LaunchPad. About SparkFun, it is our local sparkfun reseller, it just have another name, but they sell SparkFun boards (and a few other suppliers from the world wide web). My board is genuine, I got the stickers, and the paperwork say it is Arduino and manifactured and validated under license, warrant that it is 100% conform to specifications.
Back to newb stuff. If ACM0 is valid, why do I get
arvdude: usbdev_open(): did not find any USB device "usb"
Error message? Is the last stable version too old? I use Arduino 1.0 / avrdude 5.11.1.
EDIT: I had the wrong settings, work now