[REQUEST] How to Downgrade Lenovo Ideapad BIOS

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[REQUEST] How to Downgrade Lenovo Ideapad BIOS - U410

Posts: 3
Threads: 1
Joined: Aug 2015
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DaveN_Ott Offline

Junior Member

08-22-2015, 11:13 AM (This post was last modified: 08-22-2015, 11:15 AM by DaveN_Ott.)

Hi, new to the forum (though not new to computers) and I've searched around for 2 days for a potential answer to this, if answer already posted please send me a link.

My upgraded my Windows 7 U410 to Windows 10 and it was running sluggish. I decided to see if there were updates for the BIOS and found that there were two:

65cn21ww.exe - for Windows 7
65cn99ww.exe - for Windows 8.1

As Windows 10 seems more like 8.1 than 7 I decided to flash the 65cn99ww.exe BIOS. Big mistake, windows 10 wouldn't boot, tried everything that I could think of in the BIOS to get things working and it seems that the update broke the UFEI / RAID setup. Tried restoring backups - no go then fresh install of windows 7 and couldn't downgrade the BIOS - 233 error. Even tried fresh install of 8.1 & 10, no luck on downgrading, then I found this forum. Try as I might I couldn't find or figure out how to downgrade the BIOS.

I found poster's link to the 65cn13ww.exe BIOS (appears to be original contents of the SFX file) and another post about replacing the "environment.dll" file in one of the "[REQUEST] Lenovo IdeaPad U410 Whitelist removal request ..." threads

All this to ask what is the best way to downgrade the BIOS on my originally Windows 7 Lenovo Ideapad U410?

Thanks
Dave