SUUNTO QUEST - Manual (Page 32)

10.3 Changing language
If you want to change the device's language or you have chosen the wrong
language when setting up the device, the device needs to be put to sleep. For
information on how to put the device to sleep, see Section 10.2 Sleep mode and
initial settings on page 30.
Alternatively, you can adjust the language in Movescount.com
NOTE: The device remembers your previous initial settings and recorded
training sessions.
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