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shaesh
Paper Tape
Posts: 6
Registered: ‎10-13-2008
Location: US
Views: 2,619
Message 1 of 6

Downgrade from Spectre BIOS update on X1 Carbon 20A7 due to spurious reboots

Sadly I installed the [now withdrawn] GRET54WW (1.31 ) BIOS update which patched the Spectre vulnerability on my X1 Carbon 20A7 model a couple of weeks ago. I've since been experiencing spurious reboots when coming out of sleep and random BSODs --- which are obviously the reasons for the update being withdrawn.

 

Is there a way to downgrade the BIOS to a prior level? Not sure that I can live with this until 3/31/2018!

 

Community SeniorMod
Community SeniorMod
Posts: 3,325
Registered: ‎12-01-2007
Location: US
Views: 2,574
Message 2 of 6

Re: Downgrade from Spectre BIOS update on X1 Carbon 20A7 due to spurious reboots

[Messaged moved to Security & Malware board for visiblity.  AG]



I am a volunteer and neither a Lenovo nor a Microsoft employee.

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Community SeniorMod
Community SeniorMod
Posts: 3,325
Registered: ‎12-01-2007
Location: US
Views: 2,572
Message 3 of 6

Re: Downgrade from Spectre BIOS update on X1 Carbon 20A7 due to spurious reboots

Hello,


All previous UEFI BIOS Firmware versions are available for download towards the bottom of this page:

 


Name: BIOS Update Utility for Windows 10 (64-bit), 8.1 (64-bit), 8 (64-bit), 7 (32-bit, 64-bit) - ThinkPad X1 Carbon (Type 20A7, 20A8)

URL: https://pcsupport.lenovo.com/uu/en/products/laptops-and-netbooks/thinkpad-x-series-laptops/thinkpad-...


I'd suggest going back to v1.30, the immediately previous version, and see if that resolves your issues.

 

Regards,

 

Aryeh Goretsky

 



I am a volunteer and neither a Lenovo nor a Microsoft employee.

L380 YogaP72 (20MB-*)P50 (20EN-*)S230u (3347-4HU)T23 (2648-LU7)T42 (2378-R4U)T43p (2678-H7U)T61p (6459-CTO)W510 (4318-CTO)W530 (2441-4R3)W530 (2441-4R3)X100e (3508-CTO)X120e (0596-CTO)X220 (4286-CTO)X250 (20CM-*)Yoga 370

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CrypticLottery
Token Ring
Posts: 51
Registered: ‎01-08-2018
Location: US
Views: 2,496
Message 4 of 6

Re: Downgrade from Spectre BIOS update on X1 Carbon 20A7 due to spurious reboots

According to https://support.lenovo.com/us/en/solutions/len-18282, look at the revision history subsection. Revision #10 indicates that microcode updates are not reversable, so if you've updated your microcode and you're experiencing system stability issues and you're running Windows, you can try disabling one of the Microsoft patches for CVE-2017-5715 if you're seeing WHEA errors in Event Viewer.

 

Follow the steps listed here https://forums.lenovo.com/t5/ThinkPad-T400-T500-and-newer-T/KB4056892-multiple-problems-on-T440s/m-p...

shaesh
Paper Tape
Posts: 6
Registered: ‎10-13-2008
Location: US
Views: 2,424
Message 5 of 6

Re: Downgrade from Spectre BIOS update on X1 Carbon 20A7 due to spurious reboots

Thanks. I've just tried this and will see how it goes... 

superadmin
Fanfold Paper
Posts: 12
Registered: ‎06-22-2018
Location: DE
Views: 1,351
Message 6 of 6

Re: Downgrade from Spectre BIOS update on X1 Carbon 20A7 due to spurious reboots

Same problem here. I just bought the Carbon X1 6th gen maxxed out. After initial setup of W10 everything was cool and quiet, even when watching 4K on Youtube. Then I installed the latest recommended Lenovo Updates including the Spectre side channel BIOS upgrade and the fan spins fast and goes rarely silent. I will now try out Linux and report back here.

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