How do I install a SIM card in the FC2 Controller?
The FC2 does not support hot swap, so you must shut down the controller and disconnect the charger before installing the SIM card. Use a special screwdriver to unscrew the battery cover screw, pry off the cover, remove the battery if applicable, and then install the SIM card in the designated location. (Page 7-8)
From the official Efix Fc2 Handheld Controller manual, page 8
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