Systems Management Question
07/23/2017 899 views
I have an Inspiron 5559, The System BIOS is 1.2.1 , /service Tag is G8SYPC2, ePSA Build 4304.09 UEFI ROM.
It says "Operating System Loader signature not found in SecureBoot database ('db'). All bootable devices failed Secure Boot verification.
How do I fix it?
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