If you have access to the configuration portal, at the end of the information window there is a deletion option: Proceso de borrado del KiWi.
In case you do not have access to the portal, you can delete the configuration manually through the reset button located in the hole on the top cover of the KiWi. It is necessary to insert a very narrow element and hold down the button for about 10 seconds.
Botón de reset del KiWi
You can download the manual from the following link
