HP EliteDesk 800 G2 BIOS corrupted by HP bios update

[GIFixed]

After updating BIOS to:

HP EliteDesk 800 G2 TWR/SFF
02.42 Rev.A 17.2 MB 12. sep 2019

corrupted the bios.

Thanks

[GIFixed]

HP EliteDesk 800 G2 BIOS corrupted by HP bios update

After updating BIOS to:

HP EliteDesk 800 G2 TWR/SFF
02.42 Rev.A 17.2 MB 12. sep 2019

(link: https://ftp.hp.com/pub/softpaq/sp990...00/sp99042.exe)

It finished flashing and rebooted - Does not POST at all.

- Tried trick with Win key + B and power to recover.
- Tried remove CMOS battery
- Tried pressing CMOS button for 10 seconds

Nothing of these helps.

When taking power and draining remaining power, and then applying power again it do the following:

RED power light and beeps 2 long and 4 short.


By the way, the bin file is 9 MB in size.

Thanks for any help

[SMDFlea]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

Post your bios backup .

[GIFixed]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

Post your bios backup .

Sorry, I cant find it

Is there any other way to flash a working full BIOS?

[RethoricalCheese]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

Can't you dump your faulty bios? You can use that faulty bios and file from HP and combine them. When it's working, you might have to use dmifit tool to insert dmi information.

[GIFixed]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

Can't you dump your faulty bios? You can use that faulty bios and file from HP and combine them. When it's working, you might have to use dmifit tool to insert dmi information.

I will try to dump the BIOS chip using TL866 programmer.

The windows HP bios update tool did take a backup of my bios. Its size is 9 MB. Same size as in the update tool.

Then this should be not a full backup and useless, do you agree?

By the way, I would like to learn how to edit/combine/fix bios files. Is there a good toturial?

[SMDFlea]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

The 9MB file is the bios region,its the only part that gets flashed and backed up.The rest of the bios is locked,the flash descriptor and ME region.See the description here:
https://winraid.level1techs.com/t/gu...lization/31277
You can overwrite the bios region using a hex editor ,such as HxD .https://mh-nexus.de/en/hxd/

[GIFixed]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

By the way,

Any body knows why there are two flash chips in this machine:

1) 25Q64FVSIQ near the Nuvoton NPCD315HA0DX
2) 25Q128FVSQ near Infenion SLB9670 and the E16 header marked "ROM RCVRY".

The E16 header is not populated (no pin header soldered).

Could not find any pinout of this E16 2x5 pins header. Pin4 is key.

Other HP models uses 8-pin recovery header with to CS# pins tied together by a jumper. What I could see on videos/tutorial you disconnect this jumper and attach external programmer directly to this header for dump and flashing bios without desoldering.

Any help on this one?


Is it possible to dump the full BIOS without desoldering on this machine. And without harming any other components?


It seems this machine is still under warranty, but HP demands the purchase invoice to correct warranty expiration date. We are seeking to find the invoice. Until now not succeeded to find it.

[GIFixed]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

Can't you dump your faulty bios? You can use that faulty bios and file from HP and combine them. When it's working, you might have to use dmifit tool to insert dmi information.

We are checking the warranty with HP. Until then I prefer to be cautious to not void the warranty.

But anyways it is a good thing to learn about tackling this problem.

[RethoricalCheese]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

There are soic8 clips so there is no need to unsolder most of the times.

[GIFixed]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

There are soic8 clips so there is no need to unsolder most of the times.

Yes, thanks, I am aware of that SOIC8 clip. But with this particular machine, does it fry the EC?

KvnTM told me before in another thread regarding Yoga 2 pro, that using a clip will fry the EC.

Is there a way or a rule to determine, if there are possibilities to destroy the EC or another components by flashing BIOS onboard using clip or direct connect?

[RethoricalCheese]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

It will not fry any EC. You just have to use the correct voltage. If it is a 1.8V eeprom, use 1.8V programmer. If it is a 3.3V eeprom, use a 3.3V programmer.

Winbond eeprom with FV in the model is 3.3V. If it is FW instead, it is 1.8V.

[GIFixed]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

Nobody has an answer to why there are two flash chips on this elite desk 800 g2 model?

[RethoricalCheese]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

One is main bios, other is EC bios.

[GIFixed]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

One is main bios, other is EC bios.

Thanks.

Could it be the EC bios that is corrupted?

[RethoricalCheese]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

Try flashing clean main bios first, then you will know.

[GIFixed]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

Try flashing clean main bios first, then you will know.

I no longer have this G2 machine. The seller did exchange it for me with a better G3.

Thanks for your help.

[by_mex]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

hi,

HP EliteDesk 800 G2 main, bios please

[peste]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

hi,

HP EliteDesk 800 G2 main, bios please

post the original bios here

[by_mex]

Re: HP EliteDesk 800 G2 BIOS corrupted by HP bios update

post the original bios here

ok wait pls