Remote motorized volume control / 4-input relay switch: source code for STC89C52RC microcontroller

I recently bought a passive preamp from AliExpress. It is nicely made, with a motorized potentiometer and 4 relays to select and input. There is also an on-board relay to power on/off other devices, though that is not currently attached.

The IR signal from the remote control is decoded and the motor and relays are controlled via a 40-pin STC89C52RC 8-bit 8051-style microcontroller. I'd like to modify that code so that the preamp responds correctly to several different remote controls. Does anyone know if there is source code available for this on GitHub or similar?
 
That's hard, especially without a circuit diagram. There's no guarantee that "code protection" features are not enabled. Even if you somehow manage to read the device, you'd still be looking at assembly level code.

And, remapping the remote codes is equivalent to making your own box using another MCU ..

If I remember correctly you're the same guy with the LG remote and no volume control because of TOSLINK, right ?
 
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