roberman Honor Student
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Z640 BIOS Downgrade from Ver2.47 to Ver2.45


Hi All,


We are using the Z640 with RedHat 7.4 now, the current BIOS version is 2.47, due to some reason, I need to downgrade the BIOS version back to 2.45, could anyone know how to do that in simple, thanks.


Best regards


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Distinguished Professor
Distinguished Professor
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HP Recommended

Z640 BIOS Downgrade from Ver2.47 to Ver2.45

why do you think a bios downgrade is required? i can not think of any valid reason which would require this????


it's extremely rare for a consumer or workstation system not to be using the latest bios due to a OS or application issue

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Master's Graduate
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HP Recommended

Z640 BIOS Downgrade from Ver2.47 to Ver2.45



0.   Verify that the current BIOS is not blocked from reversion.


1.  Set a maximum 1GB** MBR, FAT32 partition on a USB drive.  It is helpful if the flash drive has an activity indicator.

___ **1GB is based on zX20 BIOS file size.  Confirm the capacity of BIOS for zX40.


2.  Copy the selected *.bin BIOS file to the root directory of the prepared partition.


3.  With the system, off insert the USB drive into a front panel USB 2.0 port.


4.  Start the system.  The USB LED should (if similar to zX20) show activity and indicate flashing BIOS with a display progress slider.


5. The system should finalize with a BIOS successfully updated message.


6.  Shut off the system,


7.  Remove the USB drive


8.  Reboot to BIOS


9.  Note that the BIOS version was successfully reverted.


__ Be aware that there have been historically, more than one HP BIOS version that can not be reverted, except by invoking the crisis recovery subsystem.  I discovered this when trying to revert z620 BIOS from v3.92 to v3.91.  In this example, a reversion was not allowed as the 3.92 version contained Spectre / Meltdown protection.


May I ask the reason for the reversion?


Let us know how it goes.




HP z620_2 (2017) (R7) > Xeon E5-1680 v2 (8-core@ 4.3GHz) / z420 Liquid Cooling / 64GB DDR3-1866 ECC Reg / Quadro P2000 5GB _ GTX 1070 Ti 8GB / HP Z Turbo Drive M.2 256GB AHCI + Samsung 970 EVO M.2 NVMe 500GB + HGST 7K6000 4TB / Focusrite Scarlett 2i4 sound interface + 2X Mackie MR824 / 825W PSU /> HP OEM Windows 7 Prof.’l 64-bit > 2X Dell Ultrasharp U2715H (2560 X 1440)


[ Passmark Rating = 6280 / CPU rating = 17178 / 2D = 819 / 3D= 12629 / Mem = 3002 / Disk = 13751 / Single Thread Mark = 2368 [10.23.18]


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