ab350 pro 4 impossible to turn off csm

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   I recently had an incident where I turned off my computer while it was starting up (possibly updating?) which caused me to be unable to boot to windows anymore. I originally installed windows 10 but had upgraded to 11. After trying a few different things I decided to just reinstall Windows. This turned out to not be so easy as I kept seeing a bluescreen when booting from my installation usb. I tried windows 10 and 11. In the end I was forced to use csm mode. Is there any way to get csm off to work on this motherboard ? I'm on bios L8.02 with a ryzen 7 1700. Thanks

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hamburgler901 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Jun 2024 Status: Offline Points: 95	Post Options Post Reply Quote hamburgler901 Report Post Thanks(0) Quote Reply Topic: ab350 pro 4 impossible to turn off csm Posted: 24 Jun 2024 at 10:16am
	I recently had an incident where I turned off my computer while it was starting up (possibly updating?) which caused me to be unable to boot to windows anymore. I originally installed windows 10 but had upgraded to 11. After trying a few different things I decided to just reinstall Windows. This turned out to not be so easy as I kept seeing a bluescreen when booting from my installation usb. I tried windows 10 and 11. In the end I was forced to use csm mode. Is there any way to get csm off to work on this motherboard ? I'm on bios L8.02 with a ryzen 7 1700. Thanks

hamburgler901 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Jun 2024 Status: Offline Points: 95	Post Options Post Reply Quote hamburgler901 Report Post Thanks(0) Quote Reply Posted: 25 Jun 2024 at 11:12pm
	I used diskpart and 'list disk' to determine my bootable usb was mbr. I had used windows media creation tool. It makes sense to me that a mbr bootable media would not work with csm off. Next I used rufus to create a new bootable usb with GPT. GPT should work with UEFI. With csm off, I still get a bluescreen winload.efi error when trying to boot from the install media.

hamburgler901 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Jun 2024 Status: Offline Points: 95	Post Options Post Reply Quote hamburgler901 Report Post Thanks(0) Quote Reply Posted: 26 Jun 2024 at 5:26am
	I finally got this to work by reflashing the bios. I had tried clearing cmos previously and it didn't help.

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 25953	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 26 Jun 2024 at 11:23pm
	Thanks for the update and for sharing your fix hamburgler901. A BIOS reflash can sometimes resolve gremlins though I would always use it as a last resort unless your board supports BIOS flashback, I mention this for anyone else reading this post in the future. If you have a BIOS flashback option then there is no harm in trying it but if you do not, always approach BIOS flashing with caution, a bad flash will brick a board and cause all kinds of hassle returning/fixing it. Thanks again