We have similar topic in different thread. Rock 5B+ WWAN Support [Hardware bug]
I tested Radxa 5B+ with two cheap modems (LTE and even 5G) and few different kernels. You should definitely find this useful.
We have similar topic in different thread. Rock 5B+ WWAN Support [Hardware bug]
I tested Radxa 5B+ with two cheap modems (LTE and even 5G) and few different kernels. You should definitely find this useful.