K8056 - Firmware

In order to mount a small digital control in small models (where I need only digital signals), I bought a transmitter K8058, several receivers RX433N and, according to the demo circuit diagram of the manual, several decoders HT12D.
I unfortunately missed to verify if the K8058 protocol was compatible with the decoder, and after consulting the K8056 relay card manual, I see that the protocol is different.
I will then replace the decoder with a PIC. For this purpose, would it be possible to obtain the firmware of the card K8056?

Thank you in advance.