These instructions were taken from the nerd-out.com site.

     The Not-So-Yet-Long-Awaited APEX/VDDV AD-600A REGION/MACROVISION HACK

What to press What you'll see Press POWER.  Turn on the unit with NO DISC in the drive, make sure that the drive is closed.   Wait for "NO DISC" to display     Press SETUP. You will get the setup screen.     Press DOWN until PREFERENCES is highlighted.     Press STEP.     Press track BACK.|<<     Press track FORWARD.>>| The "Loopholes" menu is displayed.   Here in the loopholes menu you can change things like Region ID, CSS Encryption, Macrovision, and all those good things. Note, of course, that "you should not be here."