100% Fixed: Selected boot image did not authenticate windows 10 install from an external flash drive

What does ‘selected boot image did not authenticate’ mean and why it occurs?
This error appears written on a blue stripe on a black background, soon after restarting or after pressing the power button to boot. Pressing enter will only shut down the computer, eventually returning you to the same screen. In simple terms, this error means that a security protocol has been violated after being checked against a firmware database, or the device you are loading the operating system from cannot provide the information needed by security in order to boot.

Secure Boot is a technology where the system firmware checks that the system boot loader is signed with a cryptographic key authorized by a database contained in the firmware. To protect you from system changes that might cause harm to your PC, your boot sequence is saved in this database. A violation of this protocol leads to an insecure boot, therefore displaying the message. Changes can happen due to the installation of new devices, upgrade/changes on the operating system (which changes the boot loader information), change in device drivers or malware attacks.

This error can also mean that your boot loader information is missing therefore the operating system could not be loaded. The boot information is what is used to identify if there is an operating system on your drive. If the boot information cannot load, then the authentication process cannot occur or complete successfully. The boot image can become corrupt after an update or due to a malware attack. There are viruses that can lodge themselves into the boot info thus preventing a secure boot, or even wipe this information out. Changes that occur from an update can also alter the boot info and prevent start-up.

Here are the solutions that will clear the ‘selected boot image did not authenticate’ error and allow you to complete your HP computer boot.

Method 1: Change from secure boot to legacy boot in your BIOS settings
Changing to the legacy boot will ignore the operating system and hardware changes and continue the boot. If you are sure that your computer cannot complete the start due to a virus or malware attack, then this is not advisable; use method 3 instead. Here is how to disable secure boot and enable legacy support on an HP computer.
Turn the computer off completely, wait a few seconds, then turn on the computer by pressing the Power Button and immediately press Esc repeatedly, about once every second, until the Startup menu opens.
When the Startup Menu displays, press F10 to open the BIOS Setup.
Use the right arrow key to choose the System Configuration menu, use the down arrow key to select Boot Options, then press Enter.
Use the down arrow key to select Legacy Support and press Enter, select enabled if it is disabled and press Enter.
Use the up and down arrow keys to select Secure Boot and press Enter, then use the up and down arrow keys to select disabled and press Enter.
Press F10 to accept the changes and use the left arrow key to select Yes and press Enter to Exit Saving Changes.
The computer automatically reboots to Windows with Secure Boot disabled and legacy support enabled.
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