well for the Mustek DVD-R100B it`s
To enable Multi-Region Capability:
Without a disk in the recorder:-
on remote press \`setup\`
press \`return\`
press \`info\`
press numbers 8 8 8 then the required region (e.g. 1 or 4 or 0 etc)
a message confirming will appear on screen, wait until it disappears...
switch off and on again, and the setting is saved