Thank you very much to both of you to answer me so quickly :-)
Now I have better understood how this MoodleBox is working :-)
No , I don't believe that my new microSD card is bad. I have already used it without any problem.
systemctl status dnsmasq.service shows no errors (dnsmasq.service has been launched)
Before I have restore the original contents of the /etc/dnsmasq.conf file.
Things I tried 😀
ping to 10.0.0.1 responds well and also ping to 192.168.0.230
I have connected with my computer to the AP MoodleBox created by Raspberry Pi with MoodleBox and the password 'moodlebox'.
When I tried the URL 'http://moodlebox.home/' it doesn't works ! :-(
This site is inaccessible
Check if the moodlebox.home address is correct.
If there are no errors, try to run a Windows network diagnostic.
But with my smartphone I have the connect screen and I can connect as admin in my smartphone.
But not with my computer.
Could you help me ?