edit: The order of the onboard LEDs is set different, the rest works fine.
Now I can also use the software Timer, and even the dht module. Updating was a good advice.
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MicroPython v1.12-195-gb16990425 on 2020-02-24; PYBv3 with STM32F405RG Type "help()" for more information. >>>
It was the preinstalled firmware from the manufacturer. The manufacturer is called sanmulink or sanmuchina. I made a backup before updating.Do you know where the firmware came from?