Xiaomi Router 3G support appeared in the well-known ROOter firmware (GoldenOrb 2019-03-10)http://ofmodemsandmen.com/firmware.html
The firmware is primarily geared towards working with USB modems.
Previously, I used it myself and recommended people in bundles of TP-Link + USB modem.
It worked very stably.
I remember from pleasant trifles that, unlike the basic OpenWRT, where it was possible to deliver and configure everything, in the firmware from ofmodemsandmen.com
even after a complete reset, just plug the modem in and everything works right away; as well as WiFi immediately works - you can immediately go to the admin panel without wires from your phone / tablet.
Does anyone use ROOter firmware with our router? Are there any reviews?