Windows will now suggest a repair or formatting if necessary, we click on "Cancel" and open the partition "boot" on the SD in the explorer.

We now search the file mainsailos-wpa-supplicant.txt and open it with Notepad++. There we have to enter SSID and password from the home network in the marked area in lines 28 and 29. We save the changes and eject the MicroSD.

Please also change the country code in "country=DE" to the country you are in.