You can reset the firmware to its original state with a factory reset.
Using the Web UI
Sign in the Web UI, under Factory reset, click RESET, as shown below:
Using the Wi-Fi reset button
- Boot up the board and wait for the WiFi LED to go off.
- Press and hold the WiFi button for at least 20 seconds then release.
- The WiFi LED will blink fast for 1 second, and then reboot to perform a factory reset.
The WiFi LED will light up for 1 second while resetting the Wi-Fi mode. If you see this instead of blinking fast, you need to make sure you have pressed the WiFi button more than 20 seconds.