How to find out the password of the router TP-Link 3G Mobile WiFi M5250 if you have lost the lid?

Reset to factory settings and no cover with password.

Response:

Interesting question. On my TP-LINK M5250 the password is 22227804. On yours of course it will be different. There is no solution to this situation as you might think, but there is always a way out:)

Remove the battery from your TP-Link M5250. There is an IMEI there. So, the last 8 digits of the IMEI, this is the factory password from the Wi-Fi network.

Have a nice day!