I have Asus Fonepad 7 dual sim (Build ver. 5.5.1).

I want to root my device.

adb devices recognizes my device properly.

Debugging mode is on.

Even device enters in fastboot mode by executing adb reboot-bootloader in terminal (I am using Ubuntu 14.04).

I have set up android rules in /etc/udev/rules.d/99-android.rules .

I've found out my vendor id and product id using lsusb (when the device is in fastboot mode). I've made corresponding entry in android rules file. But even that didn't help.

I've tried sudo fastboot devices also. Every time I get nothing but a blank line.

Somebody please help!!