Checking your Bluetooth firmware version

If you want to know the firmware version of your Bluetooth headset (this is suppose to work on an HBH-10, HBH-15 and HBH-20), do the following:
Give the headset the name adgjm by pressing 2-3-4-5-6 on your keypad.
Press No to return to previous menu.
You should see the Version of the headset.
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Sony Ericsson Tips