@Storm-Chaser hey FYI and for reference if someone else has a z840 avoid Updating the BIOS to M60_0259(Original was M60_0252), it will brick the Motherboard, i had a dead Z840, so i just brought a new/Used Z840 Motherboard from ebay, everything was working all the memory channels, both cpu sockets, but i was planning on using the E5-26xxV4 so i thought lets update the BIOS just to be safe and get all the new patches.
Both Motherboards, the Upper one was the one i brought from Ebay to replace the Original Bottom one, that was dead
This is the version of the BIOS that bricked the New motherboard
Bad idea, it worked fine until i turned off the machine, after that i cannot make the computer POST, i tried everything on the HPE Support page, using the failbios set up, with the jumpers and a Recovery USB and nothing works, so i contacted HP(I know this Products are already EoL but i still tried) had 3 chats with different Support agens, all confirmed that its a known issue, but they still doesnt care to update the BIOS Driver page, or the HP Assitant to use a different rom than the M60_0259, since is EoL product i guess they dont support/care for it anyways.
So please im looking for an older BIOS, i just brought a BIOS Programmer and i hope i can bring the Motherboard back to Life
@Storm-Chaser i just saw that you are currently using a M60_0256 BIOS, could you please back it up and send it to me? it will be of great help, since i had a rought 2 days trying to find an older version, but everywhere theres only the one that bricked mine(Already try it, and still it does not work).