The latest version is the 1.1.3. We usually get the beta versions earlier here in the forum. Simply go to the sticky post about firmware at the top of the Rev2 thread (and be sure to be logged in) and you will find the sysex file at the bottom of the post. If you are not logged in, you won’t see the file.
You will need MidiOx to perform the update but it’s detailed very clearly in the firmware post.