Novadigital 2 Channel Dimmer with CB3S Module: OpenBeken Firmware Integration Issues

I have a Novadigital 2-channel dimmer that I want to operate on alternative firmware.



I confirmed that the device uses the CB3S module, but here comes the difference from all other dimmers I have seen here: The CB3S module only talks to the onboard MCU (HK32F03MF4P6). Only the TX line from the CB3S to the MCU exists.

The S1 and S2 switches are connected directly to the CB3S module. Here is the wiring from the CB3S module (I had to desolder it to be able to track the circuit):
MCU <- TX1 (CB3S)
MCU -> RST (CB3S)
S1 -> P9 (CB3S)
S2 -> P8 (CB3S)
LED <- P6 (CB3S)
Reset button -> P24 (CB3S)

So, for now, I was able to dump the firmware and also upload OpenBeken, but I cannot configure it because of the said differences.
readResult...-16-31.bin Download(2 MB)

Any ideas from the community?

Hey, thank you for posting. We'll try to help to get this running for you.
I think it;s either TuyaMCU or "girier MCU".

TuyaMCU resource:
https://www.elektroda.com/rtvforum/topic3898502.html

Girier:
https://www.elektroda.com/rtvforum/topic3985978.html
newer driver:
https://github.com/openshwprojects/OpenBK7231T_App/blob/main/src/driver/drv_girierMCU.c

Judging from the fact that switches are connected to the WiFi module, and not to the MCU, I'd say it's the latter. So I would try with: