I have forgotten the combination for my electronic safe - brand: Cathedral 20EA.

I have the emergency key so can gain access.  Nonetheless I want to
know how to reset the combination.

OPen the safe and press the red button and the yellow lights goes on.
In put a new number (1-8 bits) then followed by the letter "A" or "B",
the safe will then confirm with 2 beebs. If you get 3 beeps and the
yellow light is flashing the code is invalid and you should try again.

The default code should be 159 followed by "A" or "B", each press will
result in the a bleep and the yellow light flashing, once the code is
complete the light will go green.

Hope that helps