Just curious, but what kind of settings are you trying to get to, and what benefit is there to change them?
Here are instructions on how to get into the secret menu. They appear to be the same as the N1/X1.
How to start the test mode
1. When +Battery and ACC are ON, push RESET and EJECT buttons simultaneously.
2. Release RESET button only.
3. When “password entry screen” is displayed, release EJECT button.
4. Enter the password.
5. When the password has been entered, press [ENTER] key.
6. If the correct password has been entered, the test mode menu will be displayed.
* The password entry screen, as the one used in the previous model, is no longer displayed.
<< Password for the service >>
The password is [ (up)] [ (up)] [ (down)] [ (down)] [ENTER].
If 8 digits or more are entered and [ENTER] key is pressed, it will be treated as a password error.