Change ESRT System Firmware Update GUID

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• Run CapsuleApp.efi -E to see current ESRT GUID in the FwType field.
• Generate a new GUID value.
• Change IMAGE_TYPE_ID_GUID in SystemFirmwareDescriptor.aslc to new GUID Value.

#define IMAGE_TYPE_ID_GUID    { 0xdd3b39b6, 0xd919, 0x46b5, { 0x89, 0x62, 0x4b, 0xb6, 0xd2, 0x27, 0x9a, 0xf7 } }

• Set PCD gEfiMdeModulePkgTokenSpaceGuid.PcdSystemFmpCapsuleImageTypeIdGuid in Platform DSC to the same new GUID value used for IMAGE_TYPE_ID_GUID.

[PcdsDynamicExDefault.common.DEFAULT]
!if $(CAPSULE_ENABLE)
  gEfiMdeModulePkgTokenSpaceGuid.PcdSystemFmpCapsuleImageTypeIdGuid|{0xb6, 0x39, 0x3b, 0xdd, 0x19, 0xd9, 0xb5, 0x46, 0x89, 0x62, 0x4b, 0xb6, 0xd2, 0x27, 0x9a, 0xf7}
!endif

• Build firmware image
• Update target with new firmware image
• Run CapsuleApp -E to see current ESRT GUID in the FwType field.

NOTE: If an attempt is made to use CapsuleApp.efi <CapsuleImage> to update the firmware using a capsule that uses the old ESRT GUID value, the update will fail. Capsules must also be updated with the new GUID value.

• Change [FmpPayload] section IMAGE_TYPE_ID field in Platform FDF file to the same new GUID value used for IMAGE_TYPE_ID_GUID in the SystemFirmwareDescriptor.aslc file.
• Build capsule image.
• CapsuleApp.efi <CapsuleImage> for newly generated capsules works.

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