Specifications

Yukai DVD-V300
This is the same hack as Mustek DVD V300 because the players are the same.
Yukai DVD-V560
Power up DVD without a disk. Press set-up on the remote. On the player press
next,prev,next,prev. Region code should be displayed on top right corner of
screen. Use the keys on the remote to: Use left/right arrow keys to change
region code to 255. Press down arrow. 3001 should be displayed. Use left/right
arrow to change to 3000. Press down arrow. 4001 should be displayed. Use
left/right arrow to change to 4000.
Yukai V520
Power on the unit and using the remote press 'Setup', 'Next', 'Previous', 'Next'
and 'Previous'. A service menu should then appear with a 'Region ID' option
indicated. Using the arrow keys set to '255'. Press the 'Setup' button on the
remote.
Zenith DVC2200, Zenith DVC2550, Zenith DVD2201, Zenith
DVD2381, Zenith DVD5201, Zenith IQDVC2350, Zenix Z-2001
Power on the player with no disk in the drive. Press "PAUSE" on the remote. Enter
"3 1 4 1 5 9" on the remote (the word COdE appears on the display). Enter "0" on
the remote (0 = All Regions, 1 = Region 1, 2 = Region 2, etc.) . Press "PAUSE"
on the remote. Power the player off and then back on