SOURCE: when i changed the battery
hi,
Press and hold 4 buttons on the four corners at the same time for 3 seconds to reset the watch after battrey replacement. check the last page of the manual for the same.
http://www.nike.com/timing/extranet/product/os_alticomp/osac_manual_eng.pdf
If it doesn't help then try another new battrey.
OK
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