Asus Router (Asus-WRT) LTE Modem Support ?

I baught some monh ago a router special because of the Support for 3G/4G, and printer sharing What Asus even advertise on the page.

Well it works fine but the issue they use the ppp to make the dial-up connection to the ISP. What we know about ppp ?

PPP has speed limits what maybe could reach max. 25 Mb/s of speed and more the protocol will not reach.

There was even a release where they added the cdc_ncm driver to the build and it worked fine. CDC-NCM is the high speed driver which is used for my Huawei Device E3267 which can reach the speed the ISP provides. The RT-AC56U with a external USB Plug (powered one) worked great and I didn't had and issues with this. The connection was stable and fast, so I could have reached 75Mb/s which is this what I should have (max 100 Mb/s).

Anyway they removed this again from the Build, but the driver was still there so there was one more workaround to use a script to get it connected with the fast driver but from this what I see that in the latest releases it isn't working anymore.

I opened even a case with Asus and the result was the 4G is not supported on the router as the Hardware can not handle it.....

So for what making advertisments about this, when Support later tells that this is not supported ? Good Work ASUS !