Okay, so seems like the problem is on the provider's end. Talked to them again and it seems they do have to make some change on their side (put the router MAC into their system), which they did not...

There's no modem. It's an optical cable coming into a GPON CPE, from there to a PoE adapter, from which a cat5e cable is coming out. This cable can be plugged straight into my notebook, or into the...

My concern is that the device does not work properly on cable either in router mode. I don't want it to use in AP mode.

@ArcherC8 tried and nothing. I switched the device into AP mode earlier today, and suddenly got full speed, but on cable only. This rules out faulty cable (I tried 2 anyway). WiFi is still 2mbps.

Today I got this router, plugged in the wan, set it up, upgraded the firmware to latest to get 2 Mbps both on wired and wireless from a connection that produces 500+/500+ when plugged straight into...