Kiss Technology has just released a new firmware that allows their Kiss DP-450 to play all DivX movies from 3.11 to 5.

Quote from Kiss-Technology

Fixes & new features included in firmware 2.6.6:

- Fixed time search in MPEG4
- Scaling fix for DVD
- Centered DivX subtitles
- Black frame around DivX subtitles
- 3.11 support (playback may pause on high action scenes)

By upgrading with the latests firmware, KiSS DVD player DP-450 is now supporting all versions of DivX including 3.11. When playing 3.11 in high bitrates, there is a risk of short dropouts in the picture. For instance when playing fast detailed action scenes.
You can find it here:

http://www.kiss-technology.com/support/firmwares/dp-450fw266pal.zip
http://www.kiss-technology.com/support/firmwares/dp-450fw266ntsc.zip