Lolin S3 Pro - howto put this board into bootloader mode

[PaulskPt]

See page Lolin S3 PRO.,
section: Install, Repair, or Update UF2 Bootloader.

Note that Button 0 standard is not connected to GND.
My experience is: connect pin 0 (which is connected to Button 0) to pin GND, then perform the button presses as instructed in this section. After the board is in the bootloader mode one can undo the connection between pin 0 and pin GND.