Hi, May I know which country are you located? Who is your SIM card internet service provider? Please refer to the compatibility list of the TL-MR3020....

Hi, May I know the model number of your TP-LINK product? What's the password you want to recover? Is it the wireless password?

For your case, you can try to unscrew one of the LB100 and then screw it back to the lamp base, check whether the Kasa app can control this LB100 or not. If still have issue, it's suggested to turn...

On the Deco App, go to More->Wi-Fi, then you can turn on or off the 2.4G and 5G network.

If your modem or your computer do you have special function(which I can't know), in a normal case, when the USB modem plugged into the TL-MR3020, the computer can't see the USB modem directly.

Yes, if you delete the deco on your account, and then readd it with the new account, it will bind to the new account, but need reconfigure the deco units