I am using ZTE MF823 modem/router with my Keenetic 4G II , OR other router running OpenWRT.
Problem is that my modem is not recognized by either router on *boot*.
In order for it to get discovered, I have to plug the modem in once the router is running.
OpenWrt has some sort of linux that I can access via telnet/ssh, and Zyxel has it's own CLI.
ZTE mf823 is also accessible via telnet and is running linux.