My samsung bd-c7500 dont play other dvd region than 3..i would like to unlock the dvd region to multi-region..how can i do that?

Hi,
try the following

As I live in Kazakhstan my BD-C7500 is locked to DVD region 5. Just use the codes at the end of this tutorial for your own DVD region.

1. Ensure that there is no disk in the tray.

2. Switch the player on.

3. Wait until the main menu page appears and the player stops doing anything.

4. Press the REPEAT button - just above the TV channel selector at the bottom right of the controller - and enter 5 6 7 3 2 on the number pad.

5. The region code "3" should appear at the top left corner of the screen.

6. Quickly enter a "9" to make the player region free. (Just try pressing 9 on the remote controller until you see 9 appear in the upper left corner of your TV screen.)

7. Open and close the disc tray. Power down and power up again.

13. Play a foreign DVD to verify the change.

For people from other parts of the world, all region codes are as follows

1 - 2 9 3 3 4
2 - 5 7 5 3 8
3 - 5 6 7 3 2
4 - 7 6 8 8 4
5 - 5 3 8 1 4
ok