Regarding OS 9000Pro. To my knowledge it was OS v2.03 that Yamaha deleted twice,due to reported faults. Altough a German Ver OS 2.04 was reported to have contained a fault.
Always download the Version for your country.
The newest OS V2.04 works fine without a problem in my 9000Pro.

Here is the link for the UK. http://www.yamahapkclub.com/english/whatsnew/main_whn.html

Graham UK