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Secure Boot is completely broken on 200+ models from 5 big device makers
(arstechnica.com)
This is a most excellent place for technology news and articles.
Bleeping Computer reports 813 products from 10 vendors.
Checked the BIOS update file of a Gigabyte motherboard I have here (Z170X - Gaming 7):
DETECTED PKfail untrusted certificate
Issuer: CN=DO NOT TRUST - AMI Test PK