So... after getting my board out of the dust I was trying to upload a little test sketch. But after getting an error message. I tried 'lsusb' on linux which didn't show my board so I thought it might be broken... Today I tested it on a windows machine and same problem... The sketch won't upload...
avrdude: stk500v2_command(): unknown status 0xc8
avrdude: initialization failed, rc=-1
Double check connections and try again, or use -F to override
avrdude: stk500v2_command(): unknown status 0x01
avrdude: stk500v2_disable(): failed to leave programming mode
That's the error message on windows. When I plug in my board windows won't recognize it so I installed the driver manually. Same result.
I'd really like to programm my Arduino so I'd be really pleased if I got an answer soon