2. Open the "WeChat" icon on the main page of the mobile phone.
3. Find the "Second-hand luka picture book reading robot" option on the main page of WeChat message.
4. Read the "More" menu in the lower right corner of the second-hand luka picture book reading robot page.
5. The drop-down list pops up, and click the "Unbind Device" option.
6. Click the device to unbind the device again.