Sylvania SDVD 6655 -B

May also be sold under Curtis brand (untested on Curtis brand).

Switch player on

Press eject on the remote to open tray

On the remote, press 9,9,9,9 then 0

Region:0 should appear on the screen

Switch player off, then on again

Should now be multi-region

This is a Philips hack and may work on other Sylvania models