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cyphear
Blue Screen Again
Posts: 1
Registered: ‎02-08-2018
Location: US
Views: 1,295
Message 1 of 3

How to rollback withdrawn BIOS (CPU Microcode) Update? - T550 BIOS 1.19

I have installed the "pulled" BIOS update for Spectre/Meltdown, and now have significant stability issues. There are no instructions on this page of how to rollback this update: https://support.lenovo.com/us/en/solutions/len-18282

 

In this situation, does Lenovo advise re-installing an older BIOS? Or is there a solution coming very soon? It's been several week without any updates.

Guru
Posts: 620
Registered: ‎12-30-2017
Location: PL
Views: 1,281
Message 2 of 3

Re: How to rollback withdrawn BIOS (CPU Microcode) Update? - T550 BIOS 1.19

Downgrade to older BIOS version will not help, as installer won't be able to downgrade CPU microcode. Currently Lenovo and Intel are working to provide a solution which allow downgrade to previous microcode. They have adviced to wait till downgrade method will be developed. But... you can do something to restore stability of your system. It was found, that stability issues are present, when OS is using fixes against meltdown/spectre. Actually, you can disable them. Below you'll find a guide:

https://winaero.com/blog/disable-meltdown-fix-amd-cpus-installing-kb4056892/

 

Personally, I've tested it on few devices and stablility issues were no longer present.

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...
Lenovo Employee Rydeen
Lenovo Employee
Posts: 387
Registered: ‎03-03-2017
Location: JP
Views: 1,232
Message 3 of 3

Re: How to rollback withdrawn BIOS (CPU Microcode) Update? - T550 BIOS 1.19

(contents removed due to inadequate description)

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