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Can anyone tell me what ECFirmwareMajorRelease stands for?

The key can be found in the registry at
HKEY_LOCAL_MACHINE\HARDWARE\DESCRIPTION\System\BIOS

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It is an System Management BIOS information field. This is a Microsoft document that explains SMBios support status in Windows.

"EC" is deacronymized as "Embedded Controller" and means a chip that processes some model-specific hardware events and also interprets ACPI pseudocode. (At least everything I found on the web refers to EC in this way. Also EC references are mostly found with ThinkPad laptops. This is a small explanation of what it does on ThinkPads).

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