Thierryd, I have a CTW500 player was originally 9.0.43 but i found an upgrade to 9.0.50. the player does run a little faster than the ATJ2085. These new chips were designed to support new features like larger LCD screens up to 2.2 inch, USB 2.0 High Speed data transfer and SD cards.
Here are some players that use these chips
http://www.mympxplayer.org/donate-an...er-vt1823.html
http://www.mympxplayer.org/new-player-review-vt914.html