here https://www.asus.com/in/Notebooks_Ultrabooks/X53U/HelpDesk_Download/ download asus live update to automatically download it. (if that didn't work) try this http://support.amd.com/en-us/download (You can use "Automatically Detect")
here https://www.asus.com/in/Notebooks_Ultrabooks/X53U/HelpDesk_Download/ download asus live update to automatically download it. (if that didn't work) try this http://support.amd.com/en-us/download (You can use "Automatically Detect")