Deskmini X300 - no boot from SATA after upd.v2.10

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   Hello,

I updated the UEFIBIOS of my X300 from 1.60 to 2.10 to install a new CPU. 

The update was done, it rebooted and after this the SATA SSD containing Windows10 in MBR (upgraded from previous Win7 installation some years ago) was not recognized to boot. I cannot find it any more in the list of selectable boot devices.

The CSM option was disabled. So I tried to enable it. But after restart CSM is always disabled, no matter what I set before.

1. What settings are needed to boot a MBR based Windows10 from SATA SSD? 
2. Why is CSM option not saved? Other settings in the UEFIBIOS are changed and saved correctly.
3. May I try to get back to Bios 1.70? The "new" CPU will be 3200G which is running with this version.

The SATA SSD itself is visible, when I boot Ubuntu. It is just that I cannot select it for boot any more in the UEFIBIOS.

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Magiceye04 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 Apr 2025 Status: Offline Points: 70	Post Options Post Reply Quote Magiceye04 Report Post Thanks(0) Quote Reply Topic: Deskmini X300 - no boot from SATA after upd.v2.10 Posted: 20 Apr 2025 at 3:38am
	Hello, I updated the UEFIBIOS of my X300 from 1.60 to 2.10 to install a new CPU. The update was done, it rebooted and after this the SATA SSD containing Windows10 in MBR (upgraded from previous Win7 installation some years ago) was not recognized to boot. I cannot find it any more in the list of selectable boot devices. The CSM option was disabled. So I tried to enable it. But after restart CSM is always disabled, no matter what I set before. 1. What settings are needed to boot a MBR based Windows10 from SATA SSD? 2. Why is CSM option not saved? Other settings in the UEFIBIOS are changed and saved correctly. 3. May I try to get back to Bios 1.70? The "new" CPU will be 3200G which is running with this version. The SATA SSD itself is visible, when I boot Ubuntu. It is just that I cannot select it for boot any more in the UEFIBIOS.

Magiceye04 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 Apr 2025 Status: Offline Points: 70	Post Options Post Reply Quote Magiceye04 Report Post Thanks(0) Quote Reply Posted: 20 Apr 2025 at 3:56am
	In advanced\storage I also see the SATA SSD.

Magiceye04 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 20 Apr 2025 Status: Offline Points: 70	Post Options Post Reply Quote Magiceye04 Report Post Thanks(0) Quote Reply Posted: 20 Apr 2025 at 4:42am
	OK, the root of the evil was "secure boot". When I disable it, I can save the CSM settings. And then the SATA SSD came back.

eujiq55okg Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 33 minutes ago Status: Offline Points: 15	Post Options Post Reply Quote eujiq55okg Report Post Thanks(0) Quote Reply Posted: 31 minutes ago at 4:59am
	Glad you got it sorted - secure boot causing the CSM setting to silently revert is a really easy thing to miss. I ran into something similar after a UEFI update and ended up digging through a few troubleshooting write-ups before I found the secure boot angle; this overview kakadu casino was one of the pages that came up while I was searching around for BIOS reset tips, for what it's worth. Worth double checking the boot device priority list too once CSM is toggled correctly.
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