We can’t help you much without knowing the equipment you’re using.
But yes, there is always a way to reset the factory defaults and reconfigure everything again.
If you have a backup of the configuration this can be a task for 15/30 minutes.
Please let us know what’s the AP make and model.
If you’re Using a Cisco Small Business or Home User router, press and hold the “reset” button (with the device powered on) for 45-60 seconds. This will force your device back to factory defaults…