Hi
It is not clear if you actually have problems with region codes (playing Region 1 discs on a Region 2 player) or if certain discs "hangs" the player at specific points during playback.
To make the players region-free (1st problem) and to upgrade the firmware in the players (2nd problem) you can visit
[Link: home.zonnet.nl] to get guidance - I did both with the instructions provided and it worked like a charm.
Good luck.
/Allan