B450 Pro4 CSM Boot Loop

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   I have a B450 Pro4 motherboard (bios version 3.50), Ryzen 2200G, no discrete GPU, 16GB FlareX memory 3200C14(2x8 GB, manually timed at 3200 with fast settings), 500 GB SSD, Windows 10 Home 1903.  I want to allocate 4 GB or more of memory for the Vega 8 graphics.  Per the FAQ, I am supposed to disable CSM.  When I disable CSM, save and quit, I get the ASRock splash screen, and then I'm back into bios, no matter how many times I save and quit.  Once I revert CSM back to enable, I'm able to boot into Windows.  Any ideas what I am doing wrong?

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Vulpie05 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 26 Dec 2018 Status: Offline Points: 40	Post Options Post Reply Quote Vulpie05 Report Post Thanks(0) Quote Reply Topic: B450 Pro4 CSM Boot Loop Posted: 13 Sep 2019 at 11:20am
	I have a B450 Pro4 motherboard (bios version 3.50), Ryzen 2200G, no discrete GPU, 16GB FlareX memory 3200C14(2x8 GB, manually timed at 3200 with fast settings), 500 GB SSD, Windows 10 Home 1903. I want to allocate 4 GB or more of memory for the Vega 8 graphics. Per the FAQ, I am supposed to disable CSM. When I disable CSM, save and quit, I get the ASRock splash screen, and then I'm back into bios, no matter how many times I save and quit. Once I revert CSM back to enable, I'm able to boot into Windows. Any ideas what I am doing wrong?

cx5 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 15 Sep 2017 Location: Hong Kong Status: Offline Points: 151	Post Options Post Reply Quote cx5 Report Post Thanks(0) Quote Reply Posted: 16 Sep 2019 at 8:54am
	Good morning @Vulpie05, Could by any change you are using MBR and hence not able to use CSM off, see https://docs.microsoft.com/en-us/windows-hardware/drivers/bringup/switch-from-legacy-mbr-disk-to-gpt-disk-with-windows-10
	1700XtaichiX370HISvega64CX750MOptane900P@M2ultraRISER 420x140x28>GPU>420x140x86>CPU coreV71 CMK32GX4M2B3000C15@2933,141515153252573231010444401410631661447@1.34v84ns 3266@1.55Vsoc1.12v74ns C1618193860