Introdução
If the heart rate monitor on the watch no longer detects your heart rate, then replacing the back may fix it.
O que você precisa
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Flip the watch over so that the face is down.
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Using a Y#0 screwdriver, unscrew the four 3.5 millimeter tri-head screws.
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Insert a plastic opening tool between the top and bottom portions of the case, and gently pry off the back.
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Conclusão
To reassemble your device, follow these instructions in reverse order.
1Comentário do guia
And where do you get the new replacement back? And does it just snap back on?