"A fatal esptool.py error occurred: Write timeout"

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void loop()

I get this error "A fatal esptool.py error occurred: Write timeout" when I try a simple first attempt "Controlling LED". Any ideas of what the problem.

Nothing to do with Blynk.
If you google the error and look for answers that correspond to your particular IDE then you’ll see info about how to fix it.

Common causes are poor quality USB cable or wrong serial port selected.

Pete.