@TazMie thank you so much for your answer. Unfortunately after many attempts, it still doesn't work. I am desperate.

@TazMie The devices are all wireless and not wired. Obviously only the HOME unit (which I renamed myself) is the head connected to the router. Attached the version of the firmware Thanks L

@TazMie Hi, I have 3 TL-WPA4220 and I can only change the wifi network name of one of them. The other two ask me for a password that I don't know. (admin) the default password is not working. I have...