●A factory reset of DEEBOT need to be performed. Switch ON the DEEBOT and long press the RESET button until you hear a beep or a piece of music. This can take 5-7 seconds
●Erase the App from your smart phone, then re-open the ECOVACS App/ECOVACS Home App and try again. For Apple smart phone users, double click the HOME button and swipe over the app to close it. Make sure to enter the correct Wi-Fi login with the correct Wi-Fi password as it is case sensitive.
●Check your smart phone and make small preparations:
✔Turn OFF the cellular network on your smartphone.
✔If you're using an Android smart phone, please turn ON the location services.
✔Allow the ECOVACS APP/ECOVACS HOME APP to have access to your wireless data including the WLAN & Cellular network settings.
●Check your router and make small preparations:
✔The DEEBOT does not support 5G Wi-Fi. Make sure to use a 2.4G Wi-Fi connection. If your router provides a mixed Wi-Fi connection, we suggest separating the 2.4G and 5G connections with different passwords. 
✔The router settings do not have any MAC address filter functions enabled. The data transfer channel is set between 1-13.
✔The security key protection mode is set at WPA/WPA2 (please note WEP is NOT working).
✔Reboot your router and retry.
●Use the "hotspot" from another smart phone as the Wi-Fi signal and see if you can connect to the App.
●If you are still having trouble connecting to the App, please contact ECOVACS Customer Service.