Wifi incorrect password fix? Why softwear issue or hardwear issue

The issue is with your router, not with the phone. Try restarting your router by unplugging it for 15-30 seconds. If that doesn’t resolve it next try forgetting the network (Settings/Wi-Fi - tap on the i next to the network name, then Forget this Network).

Another possibility is your router has MAC Filtering (also called Access Control) enabled. If it does your phone’s Wi-Fi address must be in the list of permitted devices.

As a last resort go to Settings/General/Reset - Reset Network Settings.