As far as I know needing a warranty or service contract to download is only for servers.And I have recently acquired an HP Z420 workstation... First, the news about Intel AMT, then this one about the HP BIOS updates... On the other hand, E5-2660 v1 in this machine is awesome (I'm comparing to AMD FX-6300 machine, so bear with me here )
BIOS and drivers appear to be available for the Z420:
HP Software and Driver Downloads for HP Printers, Laptops, Desktops and More | HP® Customer Support
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