Elitebook 840 G5 stuck in final step of bios update

[Anderl]

My Elitebook 840 G5 is stuck in final step of bios update. It is displaying "Final Step of Bios update in progress" and constantly rebooting. Until this step bios update went smooth. I let it go for more than 10 hours in this, but no change. I have tried Power+Windows+B, Power+Windows+V, ESC while booting, F2 while booting, F10 while booting, disconnect power supply, disconnect battery, disconnect buffer battery, USB Stick with Bios update on it, but no success.

Anymore ideas from the community?

[IT_WinSec · Accepted solution]

Hello @Anderl 

Welcome to the HP Support community.

I think you already tried most of the things. Just in case, please review the official article about BIOS recovery and ensure you did everything in a correct manner >> https://support.hp.com/in-en/document/ish_3932413-2337994-16

If this did not help, please reach to the HP Support department to have the device checked & serviced >> https://www.hp.com/de-de/contact-hp/phone-assist.html

Let me know if you face any difficulties.

[Anderl]

This is how I finally got it back to work:

- disconnect power supply 

- disconnect main battery

- disconnect buffer battery 

- removed SSD

- removed RAM 1 and 2

- connect power supply

- switch on and waited for beep tones

- disconnect power

- re-connected SSD

- connect power

- switched on and wait for beep tones

- disconnect power

- re-connect RAM 1

- connect power

- switched on

- acknowledge several bios messages

- system was booting again into windows - solved

- proper shutdown

- disconnect power

- re-connect RAM 2

- connect both batteries

- connect power

- boot into windows

- done

[Gifr]

Hello,

thanks for sharing your solution, it gives me a little hope.

I've also an Elitebook 840 G5, I've applied the "critical bio update" proposed by HP and end up with a bricked computer.

Unfortunately your soution does not work for me, maybe I miss something but I've done it twice. I don't understand what you have done to stop the bios to try to finish the update. I will let the cmos battery unpluged for a while to see if it helps.

[Endymion1984]

Hi:) thank you for such detailed solution. Unfortunately, It hasn't helped in my case. 

[TzortzisG]

In cases like these you can also try:

Remove power.

Remove battery.

Remove Storage (SSD/HDD).

Create Usb Bios recovery from older Bios softpaq on working system.

Attach Usb to "bricked" HP.

Plug in power.

Start emergency Bios recovery (win+B usually).

Laptop will Flash bios with working version.