CO-Release Build 21364 to Dev Channel + KB5003397 + KB5003402 to .1011

@Pauli O, just wondering if you had tried changing the setting for the CSM.  Perhaps enabling it would help..

I clean install both OS (Beta and Dev) at summer 2020 and since then this laptop has work fine with UEFI/GPT, Legacy ROM disabled, Secure boot On and even now Beta build is working with those settings.

With build 21364 this is first time this issue appeared (all previous Dev builds have been working OK) so, only change I make to BIOS is to set Secure boot Off and keep on going with that.

Let's see if next build(s) will fix this issue. 

EDIT: If Secure boot is On then it's not possible to enable Legacy Option ROM in this Dell laptop.

Hello Eddie,

As you generally observe this thread, could you please pass on my appreciation to whomever handles the Insider Download Page and have listened to my concern of adding the extension numbers to the versions.

FBH Link

Now if they could do the same for downloading MCT for Release would be great when that image gets updated.

Apparently Beta and RP now have Official ISO's for 19043.928

Thanks, and have a great weekend.

Regards,

21364 is live for me, now. Ticking along nicely, so far.  Have not seen or hit any negs to mention, as yet.  I will look back over the thread.

Cheers,
Drew![](https://learn-attachment.microsoft.com/api/attachments/1bf2f3db-dff6-4c78-92c5-393ae2a98c21?platform=QnA

Same all good except that update. 

"2021-02 Cumulative Update Preview for .NET Framework 3.5 and 4.8 for Windows 10 Version Next and Windows Server Version Next for x64 (KB5001030) - Error 0x80092004"