I´ve tested this fw called " compiled fw, Version v6.6.1 stable (b1036) for board rev. 1 & 2" from download page and has some small issues:
- you can´t configure signaling thru QGC. The switches in the page are off (you can´t change them). I´ve installed other fw from SVN and it works (r182).
- many "L1" parameters are inside unlike a standard fw. I guess this is used to test "l1" performances.
Angel