I've got a 5.10 build and only partially works (Switch Setup for Edgerouter 10X (RTL8367RB))
The issue is that the 5.x drivers for the RTL8367RB switch AND the MT7621 (which is now DSA) aren't the proper ones that are needed to make the ER10x actually work properly. My ultimate goal is to rip out the drivers from the 4.14 kernel and try to get them into the ramips target.