We got these routers with openwrt 14 and the original Mediatek drivers (or a variant off) a few years ago. Download speeds are at around 20Mbps upload a bit higher.
We tested 18.06.9 and found that the download speeds were over 50 mbps so we proceeded to spend lots of time customizing and building the firmware.... BIG MISTAKE! If you have more than 1 connection the wifi crashes and reboot is the only recovery .... i agree... we shold have tested before!
Since we spent so much time on 18 it was easy(er) to get the 19.07.7 going.... but the download speed is back down to 20Mbps again.
We can not afford to upgrade the router to 5G modules yet but i wanted to at least upgrade them to a cat6.. but what's the point with 20Mbps download speed.
Can you please tell me your results and what firmware you're using?
BTW. maybe we can collaborate with the hotspots? Thats my "bread and butter"...