Using 4G module with BananaPi
How to use BPI-4G LTE module with BPI-R2
1.Firstly, use R2 connects LTE module by USB or 14pin Headers. then execute command "lsusb" to have a look if R2 have drove the module. The red box is the id of 4G module. After seeing this, execute command "ls /dev/ttyUSB*" to make sure the 4G module have been recognised as USB devs.