Asus Zenfone A450CG Root Guide
Download the resources above and install Intel Android Driver (Download Here)
Turn Off your Asus Zenfone 4.5 A450CG
Go to Droidboot Mode (Hold Power button + Volume up)
Connnect Asus Zenfone 4.5 A450CG to the PC
Download Root file "RootZenfone450.zip" (Download Here)
Unzip RootZenfone450.zip to a folder and open command window (by pressing Shift + Right Click)
In CMD window Type : fastboot flash update rootzen450.zip
Wait until OK then reboot.
After restarting looking SuperUser application, if the application already exists Asus Zenfone A450CG means you have successfully rooted.