Service Menu on the W-ZERO3 / EM ONE

The Service Menu offers a number of engineering options for the W-ZERO3, such as NAND Flash backup/restore, speed tests, key function check etc.

To enter the Service Menu, open the slideout keyboard, press D and M and while holding, push the soft reset button next to the battery. The screen will light up in white. Use either the directional pad and the OK button or the stylus (double tap enters the selected menu).

NB! If the above combination does not start the device, check if the sliding key for no-cover start-up is OFF. This is an opening to the right of the battery that controls whether the device should be able to start without the battery cover being closed.

Link to NAND Flash back up.

I have not yet found out how to enter the EM ONE service menu.

Here is an exact replica of a Japanese post about the EM ONE service menu. Unfortunately, it doesn't say how to enter the Service Menu and the W-ZERO3 combination doesn't seem to work.