Invalid signature error detected Check secure boot policy in settings (how to fix it)

One problem that a user of a modern laptop or PC (usually occurs with Asus laptops) may encounter when booting is a message titled Secure Boot Violation with the text: Invalid signature detected. Check the secure boot policy in the settings.

Invalid signature detected error occurs after upgrading or reinstalling Windows 10 and 8.1, installing a second operating system, installing some antivirus (or running some viruses, especially if you didn't change your pre-installed operating system), disabling signature checking controller digital. These instructions provide easy ways to fix the problem and get your system to boot normally again.

Note: If the error occurs after resetting the BIOS (UEFI), plugging in a second drive or a flash drive that you don't want to boot, make sure you set the correct boot drive (hard drive or Windows Boot Manager), or unplug the connected drive - this may be enough to fix the problem.

Fix invalid signature detected error

As the error message suggests, the first thing to check is the Secure Boot settings in BIOS / UEFI (enter settings immediately after hitting Ok in the error message or via standard BIOS login methods, usually by pressing F2 or Fn + F2, Delete).

In most cases, just disable Secure Boot (set Disabled), and if UEFI has an OS selection item, try setting Other OS (even if you have Windows). If the Enable CSM option is present, enabling it may help.

Here are some screenshots of Asus laptops, whose owners are more likely to receive the error message "Invalid signature detected." Check the secure boot policy in the settings. Learn more about how to disable Secure Boot.

In some cases, the error can be caused by unsigned device drivers (or unsigned drivers that use third-party software to function). In this case, you can try to disable the verification of the driver's digital signature.

That said, if Windows won't boot, disabling digital signature verification can be done in a recovery environment that runs from a recovery disc or bootable system flash drive (see Windows 10 recovery disc , also relevant for older versions of the operating system).

If none of the above methods were able to help fix the problem, you can describe in the comments what preceded the problem - maybe you can suggest solutions.