How do I fix my robot vacuum when it won't connect to Wi-Fi after changing my router settings?

Factory reset the vacuum’s Wi-Fi by holding down the power or reset button for 10-15 seconds until it beeps or lights flash. Then delete the device from the app, force quit the app, and set it up again as new. If that fails, reboot your router and phone, and make sure you’re on the 2.4 GHz band — most cheap vacs don’t support 5 GHz. A full reset takes ten minutes and saves you from thinking the vacuum is broken.