How can i reset mi device to default?

Im using a node mcu v3 and the 0.10.2 version, and i move out from mi place and change mi wifi router. and mi device keeps mi old configuration with the old ssid and wifi password. im needing to reset the device to defoult config without the ssid and password, beacause it doesn t appearse in the new wifi network.

If you are running a recent version, you can hold down the button for >6 seconds. That will reset the WiFi.