How to reset config to defaults?

[veggie2u]

I had the pi wifi as AP, a usb wifi as client on home network, and was trying to make eth0 like the AP too. I must have messed up something as my AP now says down (oled screen). I am able to ssh to the pi from another machine, but can't seem to reset the config. I did a install with --update. No effect. Then I did an install without that flag. Still no effect. I was hoping it would reset the config and I could start over, but the AP still says down.

Anyone know how to reset the config to defaults? I am hoping not to start from a fresh Raspberry OS install.

[billz]

See restoring your default settings. You may also restore them manually.

If you used the --upgrade switch (there is no --update) this upgrades your install to the latest release without modifying your configuration.