update:

I changed my mind and took out the SD card. When connecting it to my computer, nothing happens. I do hear the 'pling', but
no screen opens and no extra directory appears. The sd card of one of the other machines however did open on my computer.
Only gave the message that he can't open the content, because it is a unknown file. This machine can be found on the computer,
but i can't get in the interface. I am now pretty sure that there is something wrong with the sd cards.

What can i do? Buy a few new sd cards. If i put the PiZero_GX10 file on there, downloaded from there website, will that maybe solve the problem?