By using Asus ZenFone flash tool you can Flash Stock ROM on any Asus Smartphone or tablets. After launching the Asus ZenFone flash tool ,just connect your Asus device with pc via USB cable and select the correct version of Stock ROM [Firmware] which you want to flash.
In the last just hit the Start button to start the flashing process.
If you get any problem to connect your device with pc then try to download Asus USB drivers on pc and then again start the whole process.it should be work for you.
