Failed BIOS update of EliteDesk 705 G2

[cheapoter]

Hello, I had a working EliteDesk 705 G2 SFF with an old BIOS version from 2016 which i decided to upgrade

(i _think_ from 2.18 to 2.52 but i may be wrong).

The update program ran under windows 10 and i hit the "restart" button at the end.

On restart i have no video output at all (no logo nor anything).

If I try to turn the PC off, it restarts with a series of beeps and the power button briefly turns red.

Is there a procedure to either complete the upgrade or revert to the previous BIOS/UEFI version ?

[BeemerBiker]

Unfortunately, that is not good

hp desktop beep codes https://support.hp.com/us-en/document/ish_1997210-1528385-16

BIOS recovery is described here

https://support.hp.com/in-en/document/ish_3932413-2337994-16

The first two steps may work.  If not then the first part of step 3

Try the "win + v" first then the win+b

The step 3 that uses a USB may work but use an old bios such as 2.18
https://ftp.hp.com/pub/softpaq/sp78001-78500/sp78298.exe

you can pick older bios also, just expand the revisions and scroll down

It may not be possible to install an older bios.  There is also a warning about upgrading from really old to new 

quote from release: "** It is possible that upgrading the bios directly to version 02.10 or newer might fail ending in a no boot state, to avoid this, bios SoftPAQ will upgrade to intermediate version"

It would have helped if the updates software gave a warning.  You might complain to HP about that.

hp worldwide contact https://www.hp.com/us-en/contact-hp/ww-contact-us.html
hp service online https://support.hp.com/us-en/contact-hp

[cheapoter]

Thanks a lot for replying (so fast !), BeemerBiker

I removed the CMOS battery for a couple minutes (not sure it actually helped), rebooted, still had no video but let the system on to hear it beep after a couple more minutes and the video was back, with a message telling me the update was proceeding. And now all seems well, the new firmware revision is active and the system boots alright. Phew, not bricked yet, thus !