TPM upgrade to 2.0 instead of 1.2

[PhilippRC]

Desired TPM Spec is 1.2 but the chosen upgrade file is to version 2.0:

* TPM Update **** Reading TPM update information from [C:\Temp\BiosSledgehammer\Models\HP EliteBook 840 G3\TPM-Update.txt]... VERBOSE: Reading hashtable from C:\Temp\BiosSledgehammer\Models\HP EliteBook 840 G3\TPM-Update.txt TPM manufacturer ID of this device: 1229346816 TPM manufacturer ID required......: 1229346816 TPM manufacturer IDs match Current TPM Spec: 1.2 (Numerical: 1.2) Desired TPM Spec: 1.2 (Numerical: 1.2) TPM Spec version matches Current TPM firmware: 6.40 (Numerical: 6.40) Desired TPM firmware: 7.62 (Numerical: 7.62) Firmware version is lower than desired, update required Update required result: Update required because of TPM Spec....: False Update required because of TPM firmware: True TPM update required! Searching firmware file entry for [6.40]... Firmware file found: [Firmware\TPM12_6.40.190.0_to_TPM20_7.62.3126.0.BIN]

[texhex]

Yes, because your TPM-Update.txt is incorrect.

Each firmware entry in TPM-Update.txt defines which file to hand over to the updater exe depending on the firmware version the device is currently on. In your example, TPM-Update.txt defines that a device with 6.40 should use the file TPM12_6.40.190.0_to_TPM20_7.62.3126.0.BIN. See the docs here: https://github.com/texhex/BiosSledgehammer#tpm-update

I guess you used one of the example files and just changed the spec version. All our example files are designed for TPM 1.2 to 2.0 updates; if you want to stay on 1.2 you need to define the firmware files for 1.2. The HP advisory lists all of them: https://support.hp.com/us-en/document/c05381064/

[PhilippRC]

Thanks, I understand now. Since the two spec versions have different firmware versions, to define a target firmware version of 7.62 already implies that spec version has to be 2.0.