Googling I found this other firmware:
http://rapidshare.com/files/67557866/backup_jxd_661.rar
The only way I've been able to make it work was using my DefaultFW + its AIMG + my 3050ABin0.bin. And it only shows the JXD logo, a clock/battery level (my MP4 doesn't have internal clock :roll
, and the menu title. Choosing any option crashes the player (can be powered off by the Reset button). I'll keep testing..
BTW this one also seems to have GB+NES emulator.