Can't Update Dell OptiPlex 7070 TPM Firmware - "TPM is Owned" Error

Hello,

I'm trying to update the TPM firmware on my Dell OptiPlex 7070 Small Form Factor, but I keep running into the error: "TPM is owned. Please clear the TPM owner."

I cleared the TPM using Windows 10. First, I opened tpm.msc and used Windows Security to clear the TPM. I also ran the Clear-Tpm command in PowerShell. I tried clearing it through the Security Processor Troubleshooting screen as well.

Then I cleared the TPM using BIOS. I entered BIOS by pressing F2, went to the TPM 2.0 Security settings, selected the option to clear the TPM, and rebooted the system.

I also performed a full power cycle. I shut down the computer, unplugged the power cord, held the power button for 60 seconds, then waited an extra minute before plugging it back in and powering it on again.

I used the official Dell TPM firmware updater. The file name is DELLTPM_NPCT750_X10_7.2.3.1_64_v1.exe. I downloaded it from Dell's website after entering my service tag.

Here are my TPM details. The manufacturer is Nuvoton (NTC / NPCT75x). The current firmware version is 7.2.1.0. I’m running Windows 10 Pro 64-bit, fully updated.

Even though Windows says the TPM is cleared and not owned, the Dell firmware update tool still says it is owned and refuses to proceed.

If anyone has successfully updated TPM firmware on a Dell OptiPlex 7070 with a Nuvoton TPM, please let me know what steps worked for you. Any help or advice is appreciated. Thank you.