My pico ist unable to activate the bootloader to upgrade the firmware 1.93 to 1.99

Fri 2018.10.05

@jm, a quick note on posting style, not sure if you were aware, but when you place a blank line between the end of a quoted text block and the next text line in succession, the subsequent text will return in original font and not in the quoted smaller Italics font.

Do you wish to continue with the firmware flash process? May I ask, were you attempting the 'Advanced Flashing' found on page:

http://www.espruino.com/Pico

We knowing this is crucial to moving forward.

At what step from #8 above is the last completed step before your error occurs?

While trying not to deviate too much from the original thread post, from the content that is displayed from the IDE output, it appears (to me anyway) that the technique for holding the button down while plugging the device in, may not be held down long enough while plugging in. What does the LED do as you continue to hold down the button at least half a second after connecting?

Now deviating:

re: ' I think, the button has no function.'

It appears you have established communications between the IDE and the Pico. Have you tried any of the tutorials found at:

http://www.espruino.com/Tutorials

and specifically the Pico button tutorial:

http://www.espruino.com/Pico+Buttons

which should prove the button on the Pico is just that, a button and I'm sure you'll find the one on your Pico is working fine as you proved with your voltage measurements.