What is Secure Boot?

Secure boot establishes a trust relationship between the UEFI BIOS and the software it eventually 

launches (such as bootloaders, OSes, or UEFI drivers and utilities). Once Secure Boot is enabled 

and configured, only software or firmware signed with approved keys are allowed to execute. Although 

Secure Boot can improve system security, people have some concerns that Microsoft’s Secure Boot 

function will make it difficult to install Linux or other systems on a Windows machine.


If your computer/laptop comes with Windows 10 as the in-built OS, it might as well have the "Secure 

Boot" function enabled by default. And with "Secure Boot" enabled, you won’t be able to boot your 

computer from a CD-ROM drive or USB memory stick, Network Interface Card, etc.


In order to install our Evren OS, you may need to disable the Secure Boot in BIOS first before plugging 

in a USB memory stick with the installer in it.


⚠️  If Secure Boot has already been disabled, you can skip this article to proceed with Evren OS 

        installation.


Please follow the steps below to disable Secure Boot in Lenovo machines.

1. Turn on the PC/laptop by pressing the Power button. 


2. During the initial startup screen, press ESC, F9, F8, F10, or F12. (Depending on the company 

    that created your version of BIOS, a menu may appear) Boot menu keys per manufacturer. Please

    navigate to the Boot menu to select the device to boot from once the BIOS screen appears.



3. Under Lenovo Utility Setup, if the Boot mode is set to EFI and Secure Boot is OFF, no change is        

    required (screenshot below).




4, If Secure Boot is enabled, please change its state to Disabled by navigating to the Security menu 

    click Secure Boot. Then select Disabled and confirm changes by clicking F10 to save and exit.




5. Your computer will automatically reboot.