How to make the Upvel 315BN work?

Question

network hardware

It all started with the fact that I bought the cheapest router that I found in the city.
Joy knew no bounds. It is configured easily, works properly, Linux is on board.
After a while, communication breaks began, pppoe turned off without recovery. Restarting the router helped.
Now pppoe is not connected at all. In order to have the Internet, you have to connect via ssh and execute # pppd
Flashing everything that I found on the office. site did not help.
Has anyone had experience with this device? Is there a wrt for it somewhere? Personally, I didn't find it.