@Golluk Hello, it is not a mistake, instead, they share the same firmware like you mentioned. So please be assured of it. Good day.

@Kaombo Hello, try to access the web UI and go to network-internet page to set it up instead of the quick setup. Still the same, please show us a short video which indicates the current issue....

@Beth26 Hello, it asks email address and password to access the web UI means that you have bound this device to your cloud account. You can use your cloud account to give it a go. You can go to cloud...

@rayatt Hello, we can do some troubleshooting to locate the issue first. What is the model number of the guests' devices? And their OS version. When they lost connection, are they still connected to...

@Waleed-Ehsan Hi, do you have an USB dongle? What is the model number of it? With it plugged into the TL-MR3420, generally speaking, it will be plug and play; Otherwise, you can enter the dial number...

@AFelippe Try to disable and re-enable wifi function and power cycle it. Besides, you can hard reset the router by holding the reset button/hole. Good day.