“How to open the battery back? I followed the manual but the back was so tight to move at all. It seems impossible to rotate it with a coin.”

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• It's very tight. After you rotate the back to the left with a coin or anything flat (guitar pick), use either a SIM tool, a jeweler's flathead screw driver, or a butter knife to ply it open where there's a thin gap.

  Answered by JeffT 3 months ago

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• I tried the same way and the plastic around the coin grove got deformed, not sure if someone knows a way to open these.

  Answered by Harsh 3 months ago

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