Have you tried resetting the router and reconfigure it? try to reset it.

drivers? Do you mean firmware? which driver do you mean？ Have you set up the range extender successfully? you can set it up through APP or WEB UI to set it up.

it seems there is no bin file for your E3272 Huawei modem. Here you can have a look : https://www.tp-link.com/en/support/3g/ Hi, you can have a look at this FAQ for some troubleshooting:...

what's the hardware version of your C3150? it seems it does support open VPN from their official website SPEC. since you mentioned your case has been forwarded to senior tech, you can ask again for...

model number of your product? You can change your Wi-Fi password to avoid someone stealing your network. What were you going to do with your email?

disable Antivirus to have a try~