OS

Install unsigned drivers
By enabling test mode
Open an elevated command prompt
bcdedit /set testsigning on
But don’t forget to disable it again when you have installed the drive
bcdedit /set testsigning off
Also SecureBoot must be DISABLED
By disabling integrity checks
Open an elevated command prompt
bcdedit /set nointegritychecks off
But don’t forget to enable it again when you have installed the driver
bcdedit /set nointegritychecks on
Also SecureBoot must be DISABLED
From advance boot menu
Restart your computer by holding the shift key while clicking on restart
In the advanced boot menu choose:
- Troubleshoot
- Advanced options
- Start-Up Settings (may be on a second page!!)
- Restart
- Than choose F7 to disable driver signature enforcement
After the reboot you can install unsigned drivers. When you have installed the needed driver reboot again to enable driver signing again.