I'm currently using 5.0.0.656. Yea all OS's should work with your 9700 but each OS has different pros/cons when installed on your phone. I've installed OS's in the past on my 9700 that gave me no reception and other OS's that work flawlessly. I tried .743 but my 9700 kept freezing and lagging really badly so .656 is best for me...give it a shot.