SignedCapsulePkg[all]  0.1
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gEfiSignedCapsulePkgTokenSpaceGuid.PcdLowestSupportedFirmwareVersion

This is the lowest supported version number that can be upgraded to, as exposed via the System Firmware descriptor.
Lowest support version number that can be upgraded to via capsule update

PCD Information

NameToken SpaceToken numberData TypeDefault Value
PcdLowestSupportedFirmwareVersiongEfiSignedCapsulePkgTokenSpaceGuid0xA0010003UINT320x1