BIOS Sledgehammer can't handle TPM update files with different BUILD version

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The original TPM firmware files from HP (from SoftPaq 76423 - ftp://ftp.hp.com/pub/softpaq/sp76001-76500/sp76423.html) listed only one file for the upgrade from TPM 1.2/FW 6.41 to TPM 2.0:

TPM12_6.41.197.0_to_TPM20_7.41.2375.0.BIN

However, the TPM firmware files update from January 2017 (SoftPaq 78910 - ftp://ftp.hp.com/pub/softpaq/sp78501-79000/sp78910.html) now lists two different files for TPM 1.2/FW 6.41 to TPM 2.0:

TPM12_6.41.197.0_to_TPM20_7.61.2785.0.BIN
TPM12_6.41.198.0_to_TPM20_7.61.2785.0.BIN

Note that these two files are only different in the BUILD part of the version: 6.41.197 vs. 6.41.198. It seems .198 is only used when downgrading TPM 2.0/FW 7.61 to TPM 1.2 again as the archive contains on file for this: TPM20_7.61.2785.0_to_TPM12_6.41.198.0.BIN.

The problem is that the Win32_TPM CIM class does not provide the BUILD part in the ManufacturerVersion field, only MAJOR.MINOR.

As we depend on this class, we can never detect if 6.41.197 vs. 6.41.198 is installed. This can lead to an error during the upgrade process.

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I can confirm that machines, that are normally TPM 2.0 and are factory downgraded to TPM 1.2 by HP, will have 6.41.198 installed.

Seems we need to find a fix for this...

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I expand the settings so a firmware entry can have .A or .B attached. Then we try to the update for A and if this does not work, for B.

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First commit of the 2.46.x codebase today (5237d3d), hopefully this will enable the special handling for 6.41

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Fixed in v2.46.1. Closing issue.