I write this, because i had several problems to connect the LTE modul with the existing tutorials.
A. https://openwrt.org/toh/tp-link/tl-mr6400_v5
- Wrong package
luci-proto-uqmi, no usage of the existing LuCi configuration
B. https://gist.github.com/gamwe6/ef726b550037957a4d6d5255dc7efa7a
- I was not able to use the package "modemmanager" because of insuffient drive space