Windows 8 Underground Edition: 2013

Furthermore, Windows 8 pushed Secure Boot. Many Linux users and modders saw Secure Boot as "hardware DRM." The Underground Edition specifically stripped all UEFI requirements, allowing the OS to boot on ancient BIOS motherboards from 2006.

Some versions removed "bloatware" or telemetry services to make the system run faster on older hardware. Vital Security Warning Because this is not an official Microsoft product , you should exercise extreme caution: Security Risks: Windows 8 Underground Edition 2013

Eliminated native apps and telemetry features. Furthermore, Windows 8 pushed Secure Boot