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Red CPU Light After BIOS Update

etredelumiere33 Posted messages 4 Status Membre -  
H0enheim Posted messages 1458 Registration date   Status Membre Last intervention   -

Hello, I have a problem with my newly built PC. I tried to update the BIOS of my motherboard using the latest version available on the official ASUS website. I copied the file onto a USB drive and performed the update. However, after the installation, my PC turned off and now displays a black screen with a red LED lit near the CPU.
My motherboard is a TUF Gaming Z490-Plus. I have already tried removing the CMOS battery for some time before putting it back, but that didn't solve the problem. Unfortunately, my PC does not have a “Clear CMOS” button or a “BIOS Flashback” USB port or “BIOS Flashback” button.
Has anyone else encountered this problem? How did you resolve it? I'm really desperate and would appreciate any help possible. Thank you in advance.

4 réponses

Réponse 1 / 4
bazfile Posted messages 58430 Registration date   Status Modérateur Last intervention   20 245
 

Hello.

If the BIOS update went wrong, without a flashback button, it's back to Asus's support service.

bazfile
Moderator/Security Contributor.
A hello, a response, a thank you are always appreciated.
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Réponse 2 / 4
vieu bison boiteu Posted messages 44334 Registration date   Status Contributeur Last intervention   Ambassadeur 3 591
 

hi etredelumiere33

the mistake everyone makes is updating the BIOS to the latest version = which can be an unreleased beta version

instead of taking the second to last one which is actually released

manual = https://dlcdnets.asus.com/pub/ASUS/mb/LGA1200/TUF_GAMING_Z490-PLUS/F16552_TUF_GAMING_Z490-PLUS_UM_v2_WEB.pdf?model=TUF+GAMING+Z490-PLUS

- the CLEAR RTC can be done by shorting the two pins just to the right of the SATA connectors with a flat screwdriver, and with the battery removed

( Manual = 1-18Chapter 1 : Product IntroductionChapter 1
CMOS (13. Clear CMOS Jumper)

- already use the Load Optimized Settings option, save, and exit the BIOS

@+
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etredelumiere33 Posted messages 4 Status Membre
 

I have already done that and I can't access the BIOS at all.

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Réponse 3 / 4
flo88 Posted messages 28657 Registration date   Status Contributeur Last intervention   Ambassadeur 5 158
 

Hi

Was the PC functional before the flash? Why did you do that flash?

Processor?

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etredelumiere33 Posted messages 4 Status Membre
 

I had just assembled it; it was to install Windows 11, which was not compatible with the version of my BIOS, and it gave me an error message.

Before the update, the BIOS displayed correctly, and all the components were detected without any problems.

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flo88 Posted messages 28657 Registration date   Status Contributeur Last intervention   5 158 > etredelumiere33 Posted messages 4 Status Membre
 

Okay, Windows 11 is compatible with all UEFI BIOS, it may be that the security features it needs weren't activated (TPM) and the destination drive must be in GPT.

This did not require a BIOS flash, which is a risky operation; moreover, this motherboard is relatively old and it is quite likely that the BIOS was already in one of the latest versions.

Try unplugging the drives (data cable) to see if that changes anything.

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Réponse 4 / 4
H0enheim Posted messages 1458 Registration date   Status Membre Last intervention   467
 

Hello,

First of all, it's dead.
You'll need to go back to customer service as @bazfile StatutModérateur, Contributeur sécurité said.

There are ways to install Win11 while bypassing the block.

Apparently, version 2420 is needed for Win11 (the second to last one).
There's definitely a step you missed...
What CPU do you have? It also needs to be a compatible CPU...

To answer your questions, unless you have the necessary equipment that I will show; you won't be able to do much.
And if you do it, you'll have to be patient and do quite a bit of research

You should use a CH341B programmer / EPROM.
It looks like this >

Next, you'll need to do some research, install the program, and properly position the pins in the BIOS of the motherboard (your motherboard has 2 BIOS by the way).

If you have a hot air station that can go up to +200°C
Or a soldering iron and flux.
You can then try to desolder the 2 BIOS chips or just one, or swap and resolder.
There are many different processes.
Buy a BIOS on eBay, from someone who will flash the correct version of the BIOS compatible with your CPU.
Then, you will, of course, need to desolder and then resolder.

What do you decide...?

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