The upgrade failed, or the device became unusable after the update. How can I fix this?

1. Press and hold the product's reset button for 10s until the white light comes on, or connect to the product's WiFi, enter the password 88888888, open your phone's browser and enter 192.168.1.101 to open the admin management page, and tap Restore Factory Settings.

2. If the problem still exists, contact customer service staff for the detailed flashing steps. Do not use flashing tools on your own.