updating ESP32 Firmware on Maixduino

Hello,

I need help to update the firmware of the ESP32 chip on the Maixduino in order to be able to use the adc function of the board.
I found these introductions (“https://maixpy.sipeed.com/zh/get_started/upgrade_esp32_firmware.html”) but they do not work for me. When I try to start the flash download tool with the COM port I suspect is the one for the ESP32 I get the mesage “5-chip efuse check fail”. When I use the other port nothing happens besides some new dots and underscores in the command line of the download tool.

Can someone give me some help so that I can update the ESP32 chip and use the ADC function?
Thank you in advance!