Aspire AD-900, AD-1000
These are the instructions are for a player purchased in the US for use in the UK. The unit is 120/240 voltage and plays PAL and NTSC DVDs.
Open tray door
Press Setup
Press Right arrow keys to choose the option Preference Page
Press digit buttons 1 3 7 9
The TV screen will show an interface: REGION CODE: 1 (1 means region 1)
Press Up and/or Down arrow keys to change the number 1 to 0 (0 means region free)
Now the setting is OK, press Setup to exit