I tried it with a Lan cable but it doesn't work either
Did you connect the LAN cable to the router? What do you mean with no internet you can't find your Wi-Fi in the options?
Yes the LAN cable is connected to the router and I can see the Wi-Fi but I get an error message when I try to connect to it.
Funny do you still have a guarantee or a child lock in it?
I guess guarantee but I don't have a child lock in it.
Then maybe exchange them or call or write to Ps4 Support