ESP 8266 timed out waiting for packet header

Hi

I have the same issues with an ESP8285 (TYWE2S chip)...
I can flash the same code to an ESP8266 without any issues.

Everyting is wired up correctly, I checked the voltage, everything.

Does anyone have an idea? Thank you very much in advance.

Best regards.

Sebastian

esptool.py v2.8
Serial port COM10
Connecting........_____....._____....._____....._____....._____....._____.....____Traceback (most recent call last):
  File "C:\Users\Seb\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.6.1/tools/upload.py", line 69, in <module>
    esptool.main(cmdline)
  File "C:/Users/Seb/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.6.1/tools/esptool\esptool.py", line 2890, in main
    esp.connect(args.before)
  File "C:/Users/Seb/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.6.1/tools/esptool\esptool.py", line 483, in connect
    raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error))
esptool.FatalError: Failed to connect to ESP8266: Timed out waiting for packet header
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