25H2

[viperdn]

Software and Drivers for
HP Z6 G4 Workstation 25H2?

[SDH]

Are you aware of the HP Cloud Recovery Tool? This allows you to download a W10 and/or a W11 installer for your Z6 G4 (which is officially W11 eligible). More information:

https://support.hp.com/us-en/document/ish_4511095-4511141-16

Note that this page wants you to enter your Product ID so it can check whether your workstation is Windows licensed or not. Also, assuming you are officially Windows licensed via HP the system wants you to use a 32GB thumb drive for this project.. even though the download is not anywhere near that big.

You can also do a quick check to see what is available for your workstation assuming you have HP Windows licensing via a back door:

https://ftp.hp.com/pub/caps-softpaq/CloudRecovery/crsupportedplatform.html and use CTRL + F to search for Z6 G4. That will take you to the listing for your computer and you'll see the versions HP has created for W10 and W11. 

Important Note: These are only for HP workstations that are Windows licensed via HP... if yours is a Linux "branded" one you can't use this approach even if you later bought a W10/W11 Pro 64 license and have upgraded your OS with that. This has to do with licensing and money issues between MS/HP/Intel.

You also can use the Rufus approach we've posted about here in the past, which has a very nice options page that I check all the boxes on (except the bottom box). Get the latest Rufus version. I also recommend you set your BIOS to "factory defaults"... you can tune those later after OS install. I'm hoping you'd be doing a clean install onto a 1TB PCIe4 modern very fast NVMe M.2 stick in your primary on-motherboard PCIe3 M.2 socket.  Why that? Because those run faster than a PCIe3 M.2 stick even though your workstation does not have a PCIe4 socket (that comes with the next HP workstation generation, the G5 ones).

You should make sure to prepare your M.2 stick with GPT partitioning... which makes things go so much better than MBR.

It will be easy to upgrade from the provided W11 24H2 to 25H2 assuming your workstation has Cloud Recovery Tool eligibility.