Wrong Wifi / Factory reset?

Hi all,
i’ve flashed my D1 Mini Pro, connected to AP-Led and entered the credentials to my Wifi - unfortunately to the 5ghz SSID - i found out that it won’t work.
I re-flashed the D1 again in order to connect to my 2,4 ghz SSID but it still seems to have the previous settings and i can’t reconnect (it doesn’t show up in my wifi list) …
any ideas how to do a complete factory reset which also resets the board’s credential settings or is there a different way to get into the Web UI?
Thanks

There is a factory reset in Config, Security & Updates. If you are running a recent version, you can also hold down the button for ~6 seconds.

Thanks! I also found out that it can be wiped with esptool:
esptool.py erase_flash

Which button to hold for 6 seconds? In 8266, you can close the pins?

Boot/flash usually. Otherwise, GPIO0 to GND if you did not set up a different Button 0 pin.

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