Ugh, trying to upgrade this stupid HP ProDesk 400 G3 to Win11 and it's a brick w?

NetWizard37 · Post by **NetWizard37** » Fri Jan 09, 2026 4:28 am

Agreed, and one more thing – after you clear the keys, you might need to reboot twice before Windows Setup actually recognizes it.

3980cF · Post by **3980cF** » Sat Jan 10, 2026 2:50 pm

Yeah, This happened to me with the same model. I had to enable TPM *and* clear the keys in the BIOS before the check finally passed.

YOwtOvNRIEmQ · Post by **YOwtOvNRIEmQ** » Sat Jan 10, 2026 4:34 pm

+1 You could also check if there's a BIOS update from HP, as that sometimes adds proper TPM 2.0 support for older models.

ho44gr · Post by **ho44gr** » Sat Jan 10, 2026 5:46 pm

Same here. I had the same problem. Even after a BIOS update, I had to manually enable both the TPM and secure boot to finally get it working.

oaqqQMGqXzbK · Post by **oaqqQMGqXzbK** » Sat Jan 10, 2026 6:05 pm

Can confirm. You could also check if there's a separate "PTT" setting in the BIOS, as that's Intel's version of the firmware TPM on that model. Good luck!

UpgradeDude72 · Post by **UpgradeDude72** » Sun Jan 11, 2026 1:16 am

You could also try updating the BIOS to the latest version from HP's website, as that sometimes enables TPM support. Hope that helps.

872wowfaglpr · Post by **872wowfaglpr** » Sun Jan 11, 2026 3:05 pm

I had the same problem. I finally found the TPM setting buried in the BIOS under "Security" and had to enable it, then also turn on "Intel Platform Trust Technology."

jpvfPhts · Post by **jpvfPhts** » Sun Jan 11, 2026 4:56 pm

Yeah, this happened to me too. After enabling those, I also had to clear the TPM from the security menu to get it to finally pass the check. Let me know if that works.

hXclB · Post by **hXclB** » Sun Jan 11, 2026 8:03 pm

Agreed. Also, make sure the TPM isn't set to "Hidden" in the BIOS, as that can still block it.

4881b3 · Post by **4881b3** » Mon Jan 12, 2026 8:40 pm

Can confirm. You could also try a clean install from a USB drive, as the installer sometimes handles TPM differently than the upgrade assistant.