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03-07-2018 05:57 AM
Product: HP WS Z6 G4
I have brand new Z6 G4 and Z4 G4
I try to downgrade TPM device from TPM20_7.62.3126.0_to_TPM12_184.108.40.206.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.
3 REPLIES 3
03-07-2018 05:31 PM
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.
if the above does not help you may have to swap out the motherboards
03-08-2018 09:00 AM
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.
03-08-2018 10:36 AM - edited 03-08-2018 10:46 AM
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
HP Z6 G4 Workstation : https://ftp.hp.com/pub/softpaq/sp82001-82500/sp82147.exe
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