I purchased a while back a Piko decoder #56427 for my new BB 660168. I tried to read the configuration of that decoder with the ESU LokProgrammer, but it is not supported. After some research, it seems that Piko decoders are from Uhlenbrock: https://www.uhlenbrock.de/de_DE/index.htm.
Once I placed the engine on the layout, the ECoS detects a M4 decoder on the tracks. It takes a while to load, but ultimately it shows with the correct configuration and I'm able to set a picture:
However, I was not able to change the name of the engine. It took me a few trials before I thought about restarting the ECoS. Then, I was "allowed" to change the name:
This M4 protocol is quite mysterious to me ...