EXTEL 1322 E PRO ou 1322 S PRO Digicode

I had the same problem, due to a dying battery. I decided to replace this keypad, which is about 15 years old.
The procedure is as follows but depends on the type of keypad; you need two people.
It involves reprogramming from scratch:
1 Disconnect the power from the keypad
2 Press the enter key and hold it down
3 Restore power and count 10 to 20 seconds
4 Release the enter key
5 Press 1 eight or six times and then enter. The machine is then ready to accept the master key and user key
for a brief period of excitation of the latch, press 01 and not 1

Good luck.