Secure Boot. That meant having to identify the Asus BIOS key for the motherboard, enter the Asus BIOS utility and disable secure boot on my Windows 10 running PC. When i try to disable secure boot, it is grayed out and you cannot change it. Step #1: Boot into UEFI Firmware Settings. I can't find any way around this, it saves my changes for any other setting, even the boot order, but I cannot disable secure boot at all, or enable legacy boot. Go to the "Update & Security → Recovery" page. In order to disable boot on z 390 ASUS motherboard on my TUF Gaming Plus Wi-Fi set one has to go to firmware> Advanced. I can't install Ubuntu without Secure Boot turned off, and I can't turn off Secure Boot without the BIOS, but both pressing F2 on the Dell logo, and the Settings - Update and Security - Advanced Startup Options - Restart Now - Troubleshoot - Advanced options - UEFI Firmware Settings method just lead me to a black screen and spins my fans. So i am trying to disable secure boot, i have watched a lot of videos. I wanted to have a dual-boot setup on my new PC, and that is not possible when secure boot is enabled. ESC key is also the cancel operation on this prompt. Some of the newer BIOS's beep like crazy and display the prompt in a white screen that you can't miss. From advanced to secure boot and change secure boot mode from UEFI to other, exit and save changes. Secure Boot is often enabled by default on ASUS motherboards with UEFI BIOS. However, when you disable secure boot it will prompt you to enter a PIN number that is displayed on screen when the computer restarts. To fully disable the Secure Boot in Acer laptops, these are the steps you should follow. Press "Windows Key + I" to open the "Settings" app in Windows 10. Out of curiosity, I go back to the BIOS and I realize that the Secure Boot Configuration settings did not save and have all reverted back to Legacy Support Disable and Secure Boot Enable. This disables secure boot. This problem is so bad that even running Ubuntu is difficult because there isn't a good proprietary Linux display driver, so I always have visual issues, and no proprietary Bluetooth driver, so my Bluetooth is useless too. How to Enable or Disable Secure Boot on Windows 10 PC Secure Boot is a security standard developed by members of the PC industry to help make sure that your PC boots using only software that is trusted by the PC manufacturer. Secure Boot settings are only available via the UEFI screen. So, the first thing to do is boot into the UEFI firmware screen. Support for Secure Boot was introduced in Windows 8, and also supported by Windows 10. But my screen does not look like the one they have. I am running on windows 8.1 using an Asus i7-4790S 64 bit. To enable it, the reverse is done. Selected boot image did not authentica te. In Windows 8, and that is not possible when secure boot and change secure boot Settings only. 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