@dansiviter this is basically the same procedure as the link you provided, similar but it's just the way that I would do it. This is for an Arduino Nano esp32.
1./ with the board disconnected short B1 and GND
2./ plug the board into a USB port
3./ the led should be solid green
4./ remove the jumper from B1-GND
5./ the led should go to solid purple
6./ if the led is not solid purple go back to step 1
7./ open the Arduino IDE and from tools select Board : Arduino Nano ESP32
8./ from tools select COM xx (ESP32 Family Device)
9./ from tools scroll down to programmer and check Esptool
10./ finally goto sketch and select Upload Using Programmer
11./ unplug and plug back in the USB connector
keep an eye on the COM port number as this can change during this process.
Even if this does not work for you then knowing which step you get to will help track down the problem