After that, disconnect from the Wi-Fi network and reconnect. It's also conceivable that the update overwrites or nullifies previous network settings, which would explain why you can't connect to your Wi-Fi network using the default settings. In this scenario, ignoring the Wi-Fi network is perhaps the best option. Here's how you do it:

1. Go to the Settings app on your iPhone.
2. Select Wi-Fi.
3. Tap the name of the network you're currently connected to.
4. 'Forget this Network' is an option.
5. If the Forget Network notice appears, hit Forget to confirm the operation.
6. Your iPhone should be restarted.
7. Reconnect or re-join the Wi-Fi network.

see problem fix or not