How to reset SECRUI wireless doorbell receiver (Model: M520)

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How to reset SECRUI wireless doorbell receiver (Model: M520):

Clear All Settings---First unplug the receiver, then long press and hold "VOLUME" button and plug in the outlet, you will start to hear continuous beeping and the LED light will flash ten times. Keep on pressing and holding the "VOLUME button until there is no more sound and light, the receiver and transmitter are now all reset.
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I've tried doing this, but my bell still isn't working 😕

revver