The early 3.x firmware were for players like these:
http://img190.imageshack.us/img190/8464/s1mp3.jpg
Most 9.x firmware is for MP4 players with color displays, but you will occasionally find a basic mono LCD player with a '91 or '93 chip and 9.x firmware.
The ATJ2089 and '97 do have support for camera functionality, but it seems most if not all manufacturers didn't add the feature.