Unable to update HP Z420 Workstation BIOS

Question

I can't update my HP Workstation BIOS, I am getting the below error:

Error! System ROM is invalid.

I'm not actually sure what the current version was (I forgot to take a picture).

Answer 1

This forum links to a this HP support document, which says to update to a v1.23 Rev. A before updating to a later version. I'm posting the download links directly, here:

NOTE You can download HP Z420/Z620 Workstations System BIOS VERSION: 01.23 Rev. A at: https://ftp.hp.com/pub/softpaq/sp64501-65000/sp64701.exe https://ftp.hp.com/pub/softpaq/sp64501-65000/sp64701.html https://ftp.hp.com/pub/softpaq/sp64501-65000/sp64701.cva

HP Z820 Workstations System BIOS VERSION: 01.20 Rev. A at: https://ftp.hp.com/pub/softpaq/sp61001-61500/sp61312.html https://ftp.hp.com/pub/softpaq/sp61001-61500/sp61312.exe https://ftp.hp.com/pub/softpaq/sp61001-61500/sp61312.cva

I know its bad to post links, but this really saved my bacon and I can't attach a firmware package to this post).

Once I updated to that version, I was able to install the latest 3.XX version. I needed to install it because 3.94 had the following fix (!!!):

Fixes an issue where system could fail to boot after upgrading to Windows 10, version 1803.