It is very unusual that VLC does not open. You can post what command you used and people here can help you.
4k does not work well on many SBC devices right now.
Your LTE device does not work because the kernel was likely compiled without support for a cellular dialup protocol called MBIM.
You should not need to install any drivers when the provided kernel has them built in. This is up to the manufacturer to recompile the kernel with only a few more options but not bloat it up too much. They have opted to keep it very lightweight so it is easy to compile and run.