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im failed to do hard reset. maybe it was caused by the firmware. my spartan trainer still version 1.10.28 but the oldest version on this website (https://www.suunto.com/en-gb/Support/Software-updates/Release-notes/suunto-spartan-software-updates/) is version 1.11.56
so i think i need the older version of firmware (version 1.10.28) to rest my spartan trainer.
