First, delete the lock from the app:
Go to your app and log in. Select “Device” and then “Delete Device”. Confirm the deletion by selecting OK.
When the lock is deleted from your phone, use the end of a paperclip to click the button in the small center hole on top of the Danalock 10 times. A red light on the lock will indicate the reset command. Wait five seconds to confirm the command. The Danalock will now reset to factory settings.