I simply purchased a new remote the same as the original and tried to copy from the old remote according to such instructions :
PROGRAMMING QUICK REFERENCE GUIDE:
Programming the remote control for the el7 and el13 series controller
Press the UCZ button on the controller and hold it until the LED lights up and then goes out, then release the button. From this point you have about 10 s. to press briefly the desired button on the remote control (the one you want to be programmed). The LED blinks 3 times - the remote control has been memorised (blinks 2 times - controller memory full).
If we want to program the next remote control we have another 10 s. (Yes until the memory is full or the remote controls are exhausted)
If we have finished programming we wait 10 s. LED blinks 1 time - Programming complete.
NOTE: on the el7 controller when the gate function is enabled, keys A and B and C and D are rigidly paired:
A gate, B wicket or C gate, D wicket.
REMOTE programming for el7 and el13 series controllers (also el3V5) !!! Does not work on controllers before 2013 !!!
In order to programme the remote control remotely you must have an already programmed 4-button remote control. The gate must be fully open. On the remote control that has been programmed and is now in operation, press keys C and D simultaneously and hold for approx. 5 sec. until the indicator lamp lights up. Release the keys. From this point you have approx. 5 sec. to briefly press the selected key on the NEW remote control. If the light flashes 3 times the remote control is correctly programmed (2 times - full memory, 1 time - end of programming, remote control is NOT programmed).
Programming the remote control for the el3V5 controller
Open the housing of the controller. LED lights up. Briefly press the button on the controller. The LED goes out.
From this point we have about 10 s. to press briefly the selected button on the remote control (the one we want to be programmed).
The LED lights up and the controller returns to normal operation - the remote control has been memorised.
Unfortunately I did not open the gate controller as we have a community here and it is a bit weak how I will open the controller I only did a copy of the remote control