I know there are routers which support LTE/3G dongles (like the FRITZ!box by AVM). But if I have got a router, which officially does not suppport these dongles, but has got USB ports for NAT storage, can it support LTE/3G dongles with the correct software? Meaning, if I install a custom firmware, can the router support dongles then?
I'm talking about the "TP-Link Archer C9 AC1900", if that makes a difference.