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HP Z1 G3 BIOS update version 01.27 Rev.A won't boot after.

HP Recommended
Z1 G3
Microsoft Windows 10 (64-bit)

Just download the latest BIOS update:


HP Z1 G3 Workstation System BIOS



01.27 Rev.A 17.5 MB Nov 5, 2019


Update seems ok, then it went boot loop:


2 long beep then 4 short beep.

Then 2 long beeps 2 short beeps.

Then just black screen.


The Power Button is red falsh and the CPU fan is on.


I download the Previous version


HP Z1 G3 Workstation System BIOS

01.26 Rev.A 17.5 MB Sep 5, 2019


Found C:\SWSetup\SP99139\HPBIOSUPDREC\N52_0126.BIN

Copy it to FAT32 USB, Follow 

Fail-safe BootBlock Recovery Mode

But nothing popup or changed.


Any idea how to force BootBlock Recovery Mode?


Much Appreciate!

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