An update ..
I have finally found a way how to read and write the hidden parameters.
Solution: using openinverter can tool and sine.5.24R parameter database.

The car is finally running, thank you.

:idea: Interesting note:

Also reflashing the same firmware over and over never solves a ...

Hello Johu,

thank you for your response.

I tried uploading your firmware. The WEBUI reported that it had been uploaded, but the upload completed in just one second, so I suspect it was not successful.
I then restarted the inverter, but nothing changed. After that, I uploaded the official sine 5.35 ...

Hello,

Hello,

I have an OpenInverter board running firmware sine-5.35, connected to an ESP32 WiFi module.

**Problem 1)**

I've had an intermittent communication problem from the beginning. Sometimes it worked, but often the web interface shows the message: "communication problem between ESP and ...