In order to disable AMT function, beside disabling it in BIOS, you also need to disable it in AMT setup menu. Please follow the below steps to disable it:
1. Press "Ctrl+P" when you see "Intel ME Setup" message after POST.
2. Enter default password "admin" (if you login for the first time).
3. Enter new password (must include upeer and lower case letters, numbers, and symbols).
4. Go to "Intel Standard Manageability Configuration" -> "Manageability Feature Selection" and disable it.