After installing Microsoft Update KB3133977 for Windows 7, Why does the “Secure Boot Violation” message appear?

To protect user systems from malware attacks, ASUS motherboards implement the Microsoft Secure Boot feature by default. This feature performs a legal loader check to boot into the OS. With update KB3133977, Microsoft have changed Secure Boot policies, hence the system detects inconsistent OS loader keys, resulting in boot failure.

The solution to this issue is to change UEFI Secure Boot settings as outlined in the steps below; this will allow the system to boot into the operating system successfully.

Step 1: Enter the UEFI and navigate to Advanced Menu->Boot->Secure Boot

Step 2: Change “OS type” to “Other OS”

Step 3: Press F10 to Save and reboot

Step 4: Check the UEFI Advanced Menu->Boot->Secure Boot, and confirm the “Platform Key (PK) State” is changed to be unloaded.

Step 5: Exit the UEFI, and the system will now boot normally.

Notice

Above information might be partly or entirely quoted from exterior websites or sources. please refer to the information based on the source that we noted. Please directly contact or inquire the sources if there is any further question and note that ASUS is neither relevant nor responsible for its content/service.
This information may not suitable for all the products from the same category/series. Some of the screen shots and operations could be different from the software versions.
ASUS provides the above information for reference only. If you have any questions about the content, please contact the above product vendor directly. Please note that ASUS is not responsible for the content or service provided by the above product vendor.