Actually I just realized something: the updater programs in the Github repository does not come with avrdude tool embedded. So unless if you’ve already installed avrdude, you will probably see a ‘avrdude: no such file or directory’ error. I will update the pre-packaged updater prorams later tonight so you can download them from the firmware update instructions page:
http://rayshobby.net/?page_id=732#upload
and will post an update once that’s done.