Check this article as HowTo
Quectel EP06-E and wAP R ac (RBwAPGR-5HacD2HnD) = http://forum.mikrotik.com/t/quectel-ep06-e-and-wap-r-ac-rbwapgr-5hacd2hnd/131724/1
and remember that USB2.0 port must have marked a pins on usb 3.0 modems - I don’t know if your is usb 2 or 3.