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Can you please remove the power to the recorder (so unplug it from the power socket).
Then wait 10 minutes, connect the power again to the unit, turn it on and tell me please if it is now operating correctly.
Let me know the results please
On the unit itself, hold the channel up and down buttons for 6 seconds then release to reset the unit.
Once done, set it up and tell me how it then functions please
there is, it is under the flap on the front of it, you need to open the flap