i cannot connect with my wifi after factory reset

Can the phone "see" the network signal from the Wi-Fi router, but not connect?

Can the phone not even "see" the network signal to select it?

Can the phone see and connect to the network, but not get an Internet connection?

Can the phone connect, but you see a message about "not secure"?

Restart your router by unplugging it from power for about 15 seconds.