I tried disconnecting ALL other h/w - no success.
Since the micro seems to properly execute the last program I loaded, it seems not completely damaged.
What I could think of is a corrupted address pointing to the boot loader so that at the end the micro does not jump to the correct address,
but it almost immediately starts executing my program.
Next step is I have to get a programmer and try to get access to the micro and check / reload the boot loader.
Best regards,
Johannes
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