A factory reset or master reset is one of the last choices to consider if the problem remains if your iPhone SE still can't connect to Wi-Fi after trying all of the other fixes. This reset will erase all of your iPhone's data, including personalized settings, downloaded applications and folders, and personal data. Any system issues brought on by the new software upgrade will be resolved as well. You may then set up your smartphone as if it were brand new after the reset.

1. All of your crucial data should be backed up to iCloud or iTunes.
2. Reset the device by going to the Settings-> General-> Reset menu.
3. Erasing all content and settings is the option to choose.
4. To continue, enter your device passcode if requested.
5. To confirm the iPhone reset, tap the choice.