To see the versions, you need to enter the ’service-menu’ the same way you do, when you need to change the contrast:
1. Press and hold the upper left, lower left, upper right and lower right buttons until ‘SUUNTO’ appears on the display.
2. When the display is blank press the upper left button once - ‘SUUNTO’ will appear on the screen
3. While ‘SUUNTO’ is still displayed press and hold the upper left button
