TPM firmware update failing when run from PowerShell or Command Prompt

The following article provides information about resolving an error that is seen when running the TPM firmware update using the Command Line Interface.

Unable to install a firmware update using the PowerShell CLI (Command Line Interface)?

Running the TPM module firmware update 7.2.0.2 from PowerShell or Command Prompt, will fail when using the /s switch. The log displays an error Exit Code = 8 (Downgrade Ban Error) when the update is run using the /s and /l switches.

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***Dell Firmware Update started on 5/7/2019 at 13:33:10***
Command: C:\_SMSTaskSequence\Packages\CM10011F\DELLTPM_NPCT750_20_7.2.0.2_64.exe /s /p=  /l=C:\Temp\tpm2.log

WSMT Supported: Using WMI commands.
Registry creation is Success at \SOFTWARE\DELL\FirmwareUpdate
RemainingFlashes = 127

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Error: New TPM payload is older or same as the current TPM payload. Downgrade is not allowed.

Exit Code = 8 (Downgrade Ban Error)
***Dell Firmware Update finished at 5/7/2019 at 13:33:10***

Resolution Steps

There was an issue with the installer when using the /s switch. Dell's engineering has released a new version of the firmware.

• Ensure you are using the latest version of the firmware

Or

• Install the update manually

• Go to the Dell Support Site

• Enter the service tag or express service code to get drivers specific to how the system shipped

  Alternatively you can choose your system type from the product list to get a general list of drivers for that system

• Click the Drivers and Downloads drawer in the menu

• Ensure you have the correct operating system set

• Select Security from the category dropdown

• Locate the Dell TPM 2.0 Firmware Update Utility Ver. 7.2.0.2 V1, A01 or newer

• Click the download link and follow the online instructions