Go to www.pioneerfaq.info
Click on DVD in menu.
Then scroll down till you see DV-410 in menu, click on English flag.
Click on Firmwares in menu.
Scroll down till you see a yellow box, here are the firmwares!
StM are the once to go for, you can choose CP1252!
When you have updated your player, you cant miss that it is a new firmware
, and you have started the player again and display reads NO DISC.
Take the remote control and press and hold the ENTER button till the player turn it self off.
When you restart your player again it will be multiregional and will remain so even if you choose to update your player again.