Hi I just want to share what I did and I hope this helps you too :D
Make/Model: MSI Laptop Modern 14 B4MW
Error: Secure Boot Violation. Invalid Signature Detected. Please check your Bios Policy Setup
Occured: After Windows 11 Update
22H2 Installation
DO NOT DOWNGRADE YOUR BIOS.
Solution:
- Download the latest BIOS from MSI official page <msi.com> it will be downloaded as a ".zip" file so you need to extract the file
- Save the extracted files to a flashdrive or external drive
- Restart/reboot your MSI machine.
Upon start up, kindly press "Delete" key/button for 5 secs or so til the BIOS Menu appear
- Press the LEFT "ALT key"+ right " fn + ctrl + shift key" and f2 simultaneously
the hidden options should appear now.
- Go to ADVANCED tab
- Plug your flashdrive/external harddrive where the extracted .zip file with the latest BIOS was saved
- Click the bottom option which would be Update BIOS
- Select the respective flash/harddrive folder and click the file
- Flash Update Bios
- Restart your device, make sure not to interrupt the update as it may result to data crash and performance degradation and plug your AC Adapter/ Charger. It should be working afterwards
- Naddie