Download Custom Recovery for armani in your pc and rename it to recovery.img
and download root zip and paste it in your sdcard
Download 15 seconds adb & fast drivers and follow the instructions....
In pc type the following commands by opening cmd from shift+right click and open command prompt here after connecting the device to pc
adb reboot bootloader
fastboot flash recovery recovery.img
fastboot reboot recovery
Method 2:- Download kingoroot and root
Method 3:- Download Kingoroot pc version in your pc and load it and connect your device to pc and root....
Method 4:- Download Kingroot and click to root....if it fails in first attempt, try atleast 5 times...