In my experience you need a high level contact in Asus. Bombing with emails the Tech Support is wasted time.
I had a very serious issue with a SAS controller not working at all after BIOS 401.
I was able to get a BIOS that corrected the issue only involving a friend of a friend that works at Asus Italy.

I am not too confident that they will even put a working minute on RF BIOS, unless they have to fix a real big error.

I hope I am wrong....