Sorry for the inconvenience 1. Please confirm whether the connection between the HUB and the router is wrong. Try to place the HUB close to the router. When downloading the code library, the mobile phone sends it to the HUB through the router. If the network fluctuation will cause the card owner, 2. After the card owner, re plug and unplug the power supply of HUB, then re open the APP, re add, and delete the device that was not successfully added.