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Gusssss
Paper Tape
Posts: 3
Registered: ‎12-24-2018
Location: US
Views: 448
Message 1 of 9

How to downgrade / rollback BIOS on yoga 920? Fans went crazy.

Hi, after the lastest bios update  5NCN41WW, my fans seeem to be almost always on and the computer gets really hot. 

When i try to install an older bios, i get an error saying its a previous version.

 

 

how can i downgrade?

 

thank you!

Guru
Posts: 2,248
Registered: ‎04-17-2014
Location: US
Views: 403
Message 2 of 9

Re: How to downgrade / rollback BIOS on yoga 920? Fans went crazy.

Inside the BIOS, there might be a BIOS flash back option that you'll need to check off. Let me know if you see this.

 

Happy holidays by the way!


Regards,
Eric Xu

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Guru
Posts: 724
Registered: ‎01-04-2018
Location: US
Views: 394
Message 3 of 9

Re: How to downgrade / rollback BIOS on yoga 920? Fans went crazy.

I'd recommend trying this first: Right click the battery icon in the taskbar, go to change power options, change plan settings, change advanced power settings, go to processor power management, system cooling policy, and see if they're set to "active". If it is, set it to passive. Let me know what happens.
Gusssss
Paper Tape
Posts: 3
Registered: ‎12-24-2018
Location: US
Views: 389
Message 4 of 9

Re: How to downgrade / rollback BIOS on yoga 920? Fans went crazy.

Thank you! But processor power managment doesn't show up as an option in advanced power settings.
https://ibb.co/9nyfZDd
Gusssss
Paper Tape
Posts: 3
Registered: ‎12-24-2018
Location: US
Views: 389
Message 5 of 9

Re: How to downgrade / rollback BIOS on yoga 920? Fans went crazy.

I cannot find this option in the bios to "downgrade bios" anywhere, are you sure its there?

Guru
Posts: 724
Registered: ‎01-04-2018
Location: US
Views: 383
Message 6 of 9

Re: How to downgrade / rollback BIOS on yoga 920? Fans went crazy.

That's very odd, the options should be there but I can see in the picture that it's missing. It might be controlled by some other software. Try checking around for any "cooling" or "fan" settings.

If you can't find anything, then your fan settings might be controlled within your BIOS, might want to check there.
Bajo
Punch Card
Posts: 13
Registered: ‎02-11-2016
Location: US
Views: 297
Message 7 of 9

Re: How to downgrade / rollback BIOS on yoga 920? Fans went crazy.

I'm preparing to do this BIOS update. Did you ever get this issue resolved?

NovaFlow
Paper Tape
Posts: 3
Registered: ‎06-29-2019
Location: US
Views: 96
Message 8 of 9

Re: How to downgrade / rollback BIOS on yoga 920? Fans went crazy.

Hey there do you still have the old bios download or file. i can walk you step by step with rolling it back. because i need to do the same.

Bajo
Punch Card
Posts: 13
Registered: ‎02-11-2016
Location: US
Views: 88
Message 9 of 9

Re: How to downgrade / rollback BIOS on yoga 920? Fans went crazy.

I have the file for 38 and 41. Is that what you need?

 

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