Step 1: Enable USB Debugging on your Smartphone. To enable USB debugging, OpenSettings > Developers Option > USB Debugging > Tick to Enable.
Step 2: Download and install Nokia X Manager on your Windows Computer.
Step 3: Once Nokia X Manager is installed successfully, Open It.
Step 4: Once Nokia X Manager is launched, you will be able to see the “waiting for device” message on the top.
if u r getting not connected than do this Support for Nokia X (RM-980). Note: For device detection, user needs to manually enter code: *#*#2273#*#* on device dial-pad and enable WinUSB mode by selecting it on device’s screen. Same action is always needed after finalized flashing. and check it. and please disable or uninsatll comodo or antivirus products it is important do this thing otherwise it will not work so make sure you disable it.
Step 5: Now, Connect your Nokia X, X+ or XL smartphone to the computer using the USB cable.
Step 6: Now, In Nokia X Manager you will be able to see “Device Connected” message.
Step 7: Now, Click on the “Root Device” button to begin the rooting process.
Step 8: During the rooting process your smartphone will reboot automatically.
Step 9: Once, rooting process is completed you will b able to see the SuperSU icon in the App Menu of your device.
Step 10: Now, In the Nokia X Manager, click on the “Install Gapps” button to flash the Google applications on your device (that induces Google Play Store, etc).