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Starting the service settings
1 Tap 
[1-(1)] appears.
2 Scroll through the menu list and tap [2-(1)]
The Information screen appears.
3 Tap and hold the lower left and lower right of the 
Information screen at the same time for about five 
seconds
After the sections that were tapped and held turn green, tap   to 
return to the menu.
4 Tap [4-(1)]
The [Service settings] are displayed, and the service menu starts.
Exiting the service settings
1 Tap [1-(1)]
2 Tap [2-(1)]
The service menu is exited, and the [Service settings] are hidden.