Wireless Joint

So I have the Orbi LBR20. It accepted the SIM card from the T10, says that the SIM is registered, but it won't confirm the LTE status, then asking for a manual APN setting. I gave it Fast.t-mobile.com with no user or pass, but it won't connect. I have seen people mentioned that they had to changer ...

I have a friend who is willing to sell me his new unlocked Orbi LBR20 for $200 - would it be a good idea to grab it? He's giving me first shot but he needs to sell it quick.

Complete noob here, but My Franklin T10 has terrible connectivity, and now it is refusing to connect to Steam (I have been told it has to do with refusing access to some UDP ports). So I'd like to use the current account but transfer to a new device. Can someone recommend what I need to do and what ...