Hello, how do i use the 4G slot of the BPI-R3 with luci? The modemmanager looks like that is not enough 
Hi... See if this tutorial helps you...
Start from sharing cat /sys/kernel/debug/usb/devices output.
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exist an easy way to use the build in sim slot?
It depends on which LTE modem you have installed. You will need to add the USB drivers for your modem. The SIM slot does not do anything without a modem card installed. Modems are sold separately, the basic BPI-R3 has an empty slot.