Aiwa
XR-DV170 1. Press the power button on the player to turn it off.
2. Press and hold the TOP MENU, MENU and OSD buttons on the player until the word FACTORY appears on the LCD display.
3. Press the power button on the player to turn the player off again.
4. Insert any DVD disc and power on the player.
Aiwa DV 370 確信DVD機中無碟後開機
按pause/step
輸入3、1、4、5、9，DVD機屏上出現CODE字樣
再輸入你所需要的區碼。(0=全區，1=1區，依此類推)
然後按pause/step
關機再開機即可

Aiwa
XD-DW1 1. Open the drive lid and insert any disc, then close the lid.
2. Open the drive lid and remove the disc.
3. Close the drive lid and immediately press the STOP button on the unit.
4. After a few moments, enter 8,7,1,0 on the remote coontrol.
5. Press 1 for region 1, 2 for region 2, etc, or FAST FORWARD for multiregion.
Aiwa
XD-DW5
XD-DW7 1. Open the drive lid and insert any disc, then close the lid.
2. Open the drive lid and remove the disc.
3. Close the drive lid and immediately press the STOP button on the unit (ie almost in synchronization).
4. After a few moments, enter 8,7,2,0 on the remote coontrol.
5. Press 1 for region 1, 2 for region 2, etc, or FAST FORWARD for multiregion.

Note: if this method doesn't work, then try the method above for DW1 model, or try the next method:

1. Turn the player on with no disc inserted and wait until "No Disc" appears on the display.
2. Press Stop on the remote control, followed by 8, 7, 3, 0, followed by the region number required, or use Fast Forward for region free.

Aiwa
XD-DV480 1. Connect the DVD player.
2. Use the remote control to turn power on.
3. Wait until "No Disc" appears.
4. Press Pause and key in the following: 8, 9, 2, 6 - the display will show "CODE__".
5. Within 5 seconds press 00 for all regions, or enter region number (01, 02 etc).
6. Press Pause and Power.

To view the firmware version of this player:

1. Press the Setup button on the remote control.
2. Select TV Aspect and place the cursor on the 16:9 Wide option.
3. Using the remote control enter the code 1, 3, 9, 7, 1, 3 and 9.
4. Press the Enter button.
5. You should now see the version information screen.
6. Pressing Setup button on the remote control to exit this info.
Aiwa
HT-DV90 1. Press the DVD/CD button on the remote control.
2. Press the Open button on the remote control to open the drive tray.
3. Using the remote control, press the buttons C, 2, 5, 8, 0 and C, in order, one at a time.
4. The word TESTMODE should appear on the DVD display, and the onscreen display should indicate the current region setting.
5. Press the Up Arrow on your remote control until 14 02 is shown on the onscreen display.
Note: The 02 indicates the current region and may be different depending on what your player is currently set to.
6. Using the remote control, press the buttons 1 and then 4, then enter 0 and 0 for multi-region, or 0 and 1 for region 1, or 0 and 2 for region 2, and so on.
7. Press the Enter button on the remote control.
8. Press the Return button on the remote control.
9. The word TESTMODE should appear on the DVD display.
10. Press the C button on your remote control.
11. A message should be displayed stating EEP CLR followed by EEP ERR.
12. Place your DVD in the drive tray.
13. Press the Return button on the remote control.
Aiwa
XD-DV50 1. Press the power button on the player to turn the unit off.
2. Press and hold the Top Menu, Menu and Display buttons on the unit until the word Factory appears on the LCD display.
3. Press the power button on the player to turn the unit off.
4. Insert any disc and power on the player.
Another method if the above doesn't work:

1. Press the power button on the player to turn the unit off.
2. Press and hold the Top Menu, Menu and Display buttons on the unit until the word Factory appears on the LCD display.
3. Quickly press the power button on the player to turn the unit on
NB: If the hack does not work, you need to perform this step much sooner after step 2.

Akai DV-P1000 關機
按住EJECT和A-B鍵
開機
當A：00 D：12出現時，鬆開EJECT和A-B鍵
用PLAY(+)和STOP(-)鍵改變A：00為A：05
用Skip-Forward (+)和Skip-Backward (-)改變D：12為D:00
關機
現在你的DVD機是全區碼機。
也可以將D：12改為D：01來得到1區機，或者D：02來得到2區機。

Akai DV-P2000 關機
按住FF、Stop和DVD機上的小黑色鍵
開機
當DVD機屏上出現AKAI字樣時，鬆開FF、Stop(還要繼續按住DVD機上的小黑色鍵)
當DVD機屏上出現一串數字後，按遙控器上的Enter鍵選擇第二列
用Cursor Right鍵使DVD機屏上的數字改變為00
再按遙控器上的Enter
關機
鬆開DVD機上的小黑色鍵
開機
現在你的DVD機成了全區機