What to do if the Mi Air Purifier cannot connect to the Mi Home/Xiaomi Home APP and the indicator flashes quickly?

This fault is related to the settings of the router. You need to check the settings of the router.
The reasons are as follows:
1. Currently, it does not support public network or enterprise network Wi-Fi hotspots and does not support WEP encryption;
2. It is recommended that you change the SSID to a combination of English and numbers;
3. Check if the password is entered correctly. You can reconnect the purifier by resetting it. You can try to delete the Wi-Fi password saved on your phone and re-enter the Wi-Fi password to confirm whether it is correct;
4. You need to turn off the router MAC address filtering, which usually prohibits any new devices from joining;
5. Do not turn on the hidden SSID function, which will make the device undetectable;
6. Turn on automatic IP address acquisition. Any new device needs to use this function to obtain an IP address;
7. Check whether the router is a public router, whether too many devices have been connected, and whether the number of connectable devices has reached the maximum value of the router.