NodmCU ESP8266 not to flash

Dirk OP #7972292
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I have tried everything under different operating systems and with various USB cables. I even bought a super-short USB data cable especially for this purpose. The error message reads: ‘Failed to connect to Espressif device: Timeout waiting for packet header’. Pressing the boot or rst button did not help either. I am completely at a loss. Even the trick with the 10 my Elko was unsuccessful.

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