Tried to unlock the region on a samsung d530 now nothing works. Can i restore factory settings? thanks

I do not know, but the original grid numbers are (for region 4 at least) 1,8,9,10,19,21,22. May be if you input them this may help.

Here is the steps to make your dvd player region free:

1. get the system grid to change region.
2. change to region 2 first.
3. then change to all regions.

Part 1 -> Getting to the grid
make sure the disc tray is closed
press buttons below one after each other
1) Repeat
2) Fast Reverse (3) Next Ch (>>')
4) Fast Fwd (>>)
5) Prev Ch ('6) Play (>)
Take a note of the highlighted numbers (just in case!) in
case you need to do it all again.

Part 2 -> Change player to region 2.
Using the grid make your player into region 2 by
highlighting the numbers 2,8,19,21,22,24 then PLAY button to
save settings(this will turn your player off - you need to
turn it back on by pressing power button

Select the language again then proceed to part 3.

Part 3 -> Change player to region 0 (all regions)
Press the following buttons:
1) Repeat
2) Fast Fwd
3) Fast Rev
4) Fast Fwd
5) Up
6) Down
You should see a 0 on the top left corner!!!

Player is now REGION FREE.