Steren SEG-503 Manual De Instrucciones página 21

"DONE" will appear on the screen indicating
that the new master code was entered
correctly.
The waiting time to enter the code is 5 seconds, if you do not enter anything
within this time, the safe exits programming mode.
8 8
Repeat it once "AGAIN" appears on the
display.
If the display shows "ERROR", repeat the
steps.