TPM device not detected

[ngSubi]

I have brand new Z6 G4 and Z4 G4

I try to downgrade TPM device from TPM20_7.62.3126.0_to_TPM12_6.43.243.0.BIN. after reboot, windows not able to detect the TPM device. (in both models)

I try to troubleshoot by updating the BIOS version and clear the BIOS by removing CMOS battery - no positive result.

please suggest how to fix this issue.

Thx 

[DGroves]

and why were you trying to do a downgrade in the first place? also the bios update needs to be done FIRST before

trying to do a a firmware TPM update/downgrade as sometimes the newer bios is required for the new TPM code to work

while you can sometimes do a downgrade, it's usually limited to the same major build (IE- 20.xx.xx.xx) means that any build that starts with 20 can usually be downgraded however trying to go from v20 down to v12 is usually a no no,

you might have corupted the firmware to the point where recovery is  almost impossible

read the following link, and if you don't understand any part post back.

https://docs.microsoft.com/en-us/windows/security/hardware-protection/tpm/initialize-and-configure-o...

if the above does not help you may have to swap out the motherboards

[ngSubi]

Hi,

Thx for you reply, downgrading is part of my testing... we are using Win7x64 and win10x64 (1703). both in our environment. for win7 we just having 1.2 as default settings.  I usually do this for all new models before place the order.

Not sure what happened when downgrading this two models., (Z6 and Z4).

I will go through the below link and let you know the result.

once again thank you very much.

[DGroves]

Not all devices support a 2.0 to 1.2 downgrade. (but most do) i would check direct with HP  that this model (s ) supports it

this also might help,  try creatting a  package to reinstall the exact version of tpm that  was original on it

or see if the HP FTP site has a update package 

https://support.hp.com/th-en/document/c05792935

HP Z6 G4 Workstation :  https://ftp.hp.com/pub/softpaq/sp82001-82500/sp82147.exe

https://slightlyovercomplicated.com/2017/08/01/how-to-downgrade-tpm-2-0-to-tpm-1-2-on-hp-machines-in...