Recently I bought this Android phone. The type is Nexian NX-A891. It's a dual sim Android phone. But, this phone doesn't include USB driver in its box. So, I tried to root this phone using Linux. In the terminal, I type lsusb and one of the output includes 1d91:0016 that I believe indicating this phone, but without name or identity of this phone on the output. Then I edit the udev 51-android.rules, insert idVendor=1d91, restart udev, and type adb devices. But why is the output is just a blank "List of devices attached"? Anyone can help? Thank you so much.