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/// Lock (G, 15)
Press the "Lock" key (G) for 2 seconds to lock / unlock the device.
When the device is locked, if you press any other buttons (e.g. key E, F)
or turn any knobs (e.g. knob C, D), the Lock button symbol (15) will
flash 5 times.
The device keeps the status of "unlock" or "lock" when the power
is switched off and switched on again, which is important for
operating mode B.
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