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3 Posts

08-22-2018

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Y520 problems after BIOS update

2018-08-22, 15:57 PM
Hello,
I need your assistance please.

Previously I upgraded my notebook:
1) added 16 Gb chip of RAM, so that now I had total of 24 Gb
2) Replaced original SSD drive with 250Gb Samsung 960 EVO NVMe SSD
3) Changed Controller mode to AHCI in BIOS, and re-installed Windows to the new SSD.
 
Today morning Lenovo Update told me to download and install critical update
of BIOS. I did what it told me and after reboot I could not boot Windows.
 
Quick inspection showed me that:
1) BIOS is now version 4KCN44WW
2) BIOS not seeing new 16Gb of memory, showing only 8 Gb (memory is either got burnt or just not visible by new BIOS)
3) BIOS settings were somehow broken during update, so C: drive became D: and vice versa. I had to reinstall Windows again.
4) After Windows reinstallation, Lenovo System Update updates NVidia VGA driver and at this moment OS breaks down, display goes black,
and I return to step 3 - Windows soesn't boot and I have to re-install it once again! Tried this 2 times today..
So now I want to restore my old BIOS to previous version 4KCN24WW because
BIOS upgrade is what my today problems have begun from.
Where can I find the older BIOS version download?
Is there anything else that you could suggest me?
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807 Posts

07-10-2016

GB

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Re: Y520 problems after BIOS update

2018-08-22, 16:55 PM

The following thread describes a similar problem with the previous BIOS for this model laptop.  It is a long thread (7 pages), but it may contain useful information to help you recover from the problems that you are currently experiencing:

 

https://forums.lenovo.com/t5/Gaming-Laptops/DO-NOT-UPDATE-BIOS-4KCN43WW-ON-LEGION-Y520/td-p/4070439

 

-- from CyberSimian in the UK

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4 Posts

08-23-2018

LV

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Re: Y520 problems after BIOS update

2018-08-23, 15:52 PM
hello!
Do you find any solution? bios rollback is only way?
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3 Posts

08-22-2018

RU

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Re: Y520 problems after BIOS update

2018-08-24, 18:25 PM

Hello again,

 

Yes, I have restored the previous BIOS version, which solved all my problems! No more BSOD's or crashes, and all 24Gb memory is visible again.

 

The steps are the following:

 

1) Went to BIOS (press F2 on PC power-on) and enabled "Configuration"/"BIOS Back Flash". Without this, you won't be able to rollback to previous BIOS versions, only newer ones.

 

2) Found and downloaded the previous version of BIOS on Lenovo website. Seems like you can find the version that you need using this sort of link:

https://download.lenovo.com/consumer/mobiles/[BIOS_VERSION].exe

In my case it was:

https://download.lenovo.com/consumer/mobiles/4kcn24ww.exe

 

3) Executed the .exe and it did all the rest job.

 

4) BIOS Update have reset the settings to default. Since I have NVMe SSD, I had to switch the SATA Controller Mode to "AHCI" again, and re-install Windows.

 

Also, better disable Administrator or HDD passwords in BIOS if you have them enabled before you do anything.

 

CyberSimian, thanks for the link!

 

Cheers!

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4 Posts

08-23-2018

LV

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Re: Y520 problems after BIOS update

2018-08-24, 20:17 PM

Snx for info!

I temporarely solved this problem after install of new windows 10 by disabling windows 10 automatic update and installation of previous version of nvidia drivers. before that my newly installed windows was twice freezed with black screen after nvidia driver update via microsoft update.

 

Boljshoe spasibo za otlichnuju infu, tak i sdelaju teperj. ja reshil problemu starta nouta s kostilem, vash variart konechno kruche!

 

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3 Posts

08-22-2018

RU

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Re: Y520 problems after BIOS update

2018-08-25, 8:12 AM

You welcome! Looks like we should be careful next time when a "critical update" comes out :) And better not update BIOS unless you have the problem that an update fixes!

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4 Posts

08-23-2018

LV

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  • Message 7 of 7

Re: Y520 problems after BIOS update

2018-08-29, 7:56 AM

Snx, your solution perfectly works!

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