All the examples online tend to focus on installing the luci-proto-3g package. Then in the interface area u can set it to something like this:
The problem is there is no option to set for LTE. And i have to assume UMTS is the generic word being used to encompass the more advanced HSPA+ … if not then that is also missing. What packages (if any) does one have to install to be able to set it so the MC7455 in OpenWRT’s Luci can use LTE?