Possibly you played or ripped a region 2 disc, and the ripping software may have changed the region without your knowledge.
As for using the patch, the post I linked to pretty much explains it all - first you’ll need to download the latest official firmware for the 203N (SB02 as far as I know, available from http://www.samsungodd.com/eng/Firmware/FWDownload/FWDownload.asp ), then follow this link, which explains how to extract the .bin file from the firmware package (.exe file) you’ve downloaded.
Once you’ve successfully extracted the .bin file from the firmware package, see our Samsung FAQ for how to flash your patched firmware.
If you read C0deKing’s post carefully (plus my links above), and do things step-by-step, you should be fine - of course, if there’s any doubt along the way, feel free to ask what to do next.
BTW, I’ve moved your thread to our Samsung Burner forum, where Moderator Michael can provide further help.