Sharp DV-620 region-free hack

Power on the player and press the Setup button on your remote

Press 3 8 8 8 3

You will now enter the hidden setup page, and can change the player to any Region or set it to Region Free

Multi-Region Hack 2:

Power on the player and press the Setup button on your remote

Press 3 7 7 7 4

You will now enter the hidden setup page, and can change the player to any Region or set it to Region Free

Multi-Region Hack 3:

Power on the player and press the Setup button on your remote

Using the onscreen menu, select the Preferences option

Press Still/Step, Prev and Next

You will now enter the hidden setup page, and can change the player to any Region or set it to Region Free. You can also disable Macrovision from this menu

Video output format between PAL and NTSC:

Power on the player and press the Setup button on your remote

Press 7 2 5 5 5

You should now be able to change the output between PAL, NTSC and Auto

Disable Macrovision:

Power on the player and press the Setup button on your remote

Press 5 9 0 4 1 9

You will now enter the hidden setup page, and can turn Macrovision off and also disable CSS

Firmware Display 1:

Power on the player and press the Setup button on your remote

Press 1 2 3 4 5.

You should now see the firmware version date

Firmware Display 2:

Power on the player and press the Setup button on your remote

Press 1 2 3 4 on your remote control

You should now see the firmware version date

Thanks to Rob for the information.