Is BIOS downgrade possible?

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ulrich.von.lich · #1 Post by **ulrich.von.lich** » Wed Nov 21, 2007 6:45 pm

If so, how? Does IBM keep files of different BIOS versions so that we can choose the version we want? Is there a way to extract my current BIOS files somewhere?

Thanks!
Tony

#2 Post by **RealBlackStuff** » Wed Nov 21, 2007 7:39 pm

You can back up the BIOS you have in your TP, then upgrade or downgrade to your heart's content.
Before you downgrade, read all the info about that BIOS-version if you can find it.

ulrich.von.lich · #3 Post by **ulrich.von.lich** » Wed Nov 21, 2007 7:43 pm

Would you please explain me how to back up the BIOS I have in my TP right now and how to use it later?

Can Embedded Controller Program be downgraded too? Is it dangerous doing it?

Thanks!

#4 Post by **GomJabbar** » Thu Nov 22, 2007 9:02 am

If you go to the BIOS download page for your particular model ThinkPad (which you neglected to mention), at the bottom of the download page is a chart with links to previous versions of the BIOS updates. Same thing with the Embedded Controller.

There is also a BIOS Settings Capture/Playback Utility on the driver matrix for your ThinkPad. AFAIK, this only saves the BIOS settings. It could be handy for reapplying the same settings for different BIOS versions I suppose. I have not tried it.

ulrich.von.lich · #5 Post by **ulrich.von.lich** » Thu Nov 22, 2007 2:31 pm

Thanks Jabbar, I found the chart! Now the last question: should I upgrade/downgrade the Embedded Controller first or the BIOS?

#6 Post by **RealBlackStuff** » Fri Nov 23, 2007 7:35 am

IBM/Lenovo clearly state on the BIOS pages:
If you need to update Embedded Controller Program as well as the BIOS, update the BIOS first.

Is BIOS downgrade possible?

Is BIOS downgrade possible?

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