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Press and hold the Volume +, Scan >>, and Eject all
at the same time.
If "BOSE 321" appears and then disappears on the
display, you will need
to unplug/re-plug in the bass module.

4.) After holding them for a least 7 seconds,
release the three buttons at
the same time. Note: Some lights on the display may
be flickering before
releasing the buttons.
The display should then read "321 ???". The "???"
being the software revision.

Make sure you have latest firmware loaded:
http://groups.yahoo.com/group/bose321/

Bose 321 DVD system codes use the remote control:

To make region "0"

Number 9 Button
Number 4 Button
Shuffle Button
Stop Button
Mute Button

To enter specific regions ONLY use for region enhanced disks:

Open the disk tray first to ensure it works
Stop Button
Shuffle Button
Region number of the DVD discs sold in that region (e.g. for
region 4, press the number 4 button)
Enter

If you are unsuccesfull with the above code then it may be worth trying one of the resources below.

• JVC
• Panasonic
• Sony
• Kenwood
• LG
• Philips
• Pioneer
• Sanyo
• Technics
• Thomson
• Toshiba
• Yamaha