Quote:
Originally Posted by Nick_1964
When I press the on / off button and keep it pressing while it wents of and even longer,lets say 15 seconds.
The device is totally powered off.
If I then keep it again long pressed (like turning on) but for again 15 seconds,it seemsnothing happens and the device will not poered on/of
Then I shortly press the on and off button, the device resets without using the pin.
I don't know for sure if it needs the second long press,maybe it just resets when, after the long press which turn it off,it is shortly pressed but I keep this sequence and it works.
So with the device on,1: keep long pressed until the unit wents off,but keep pressing the button even when it is off.
2. Do the same like you will press it on, the unit doesn't react when you press it long,that is just what we want.
3. Push the on/off button short, the unit resets.
No pin needed 
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Just to be sure, are you sure this is a reset and not a factory reset?