B450-HDV R4.0 downgrade BIOS, cant boot

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   Hi, i recently updated BIOS from P1.0 to P1.50 and then to P3.10, but after flashing to P3.10 I cant boot to WIN10, that would be fine but Im stucked at black screen, so I cant even access BIOS, only way to access BIOS is to remove my M.2 SSD...I know that ( https://www.asrock.com/MB/AMD/B450M-HDV%20R4.0/index.asp#BIOS ) It says that I m not able to flash previous BIOSes but I need to try flashing it...

M.2 SSD  is working, was tested in another PC
Ultra M.2 slot on motherboard is working too, was tested with NVMe M.2 SSD and I booted to WIN10

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pao3007 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Sep 2019 Status: Offline Points: 3	Post Options Post Reply Quote pao3007 Report Post Thanks(0) Quote Reply Topic: B450-HDV R4.0 downgrade BIOS, cant boot Posted: 05 Sep 2019 at 4:03pm
	Hi, i recently updated BIOS from P1.0 to P1.50 and then to P3.10, but after flashing to P3.10 I cant boot to WIN10, that would be fine but Im stucked at black screen, so I cant even access BIOS, only way to access BIOS is to remove my M.2 SSD...I know that ( https://www.asrock.com/MB/AMD/B450M-HDV%20R4.0/index.asp#BIOS ) It says that I m not able to flash previous BIOSes but I need to try flashing it... M.2 SSD is working, was tested in another PC Ultra M.2 slot on motherboard is working too, was tested with NVMe M.2 SSD and I booted to WIN10

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 25088	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 05 Sep 2019 at 7:11pm
	Do not attempt to flash backwards, it could brick your system. Flash up to 3.20, that should resolve the M.2 issue. I am assuming you are using a first or second gen Ryzen CPU and avoided 3.20 because of the warning. You shouldn't have updated to 3.xx if you were not using a Ryzen 3000 CPU, we see this on the forums every time there is a new Ryzen launch, unstable/buggy early BIOS versions get flashed by people who don't need them. If 3.20 does not fix your issue you will need to contact ASRock Tech Support: https://event.asrock.com/tsd.asp I suspect that 3.20 should sort you out though Never update your BIOS on AM4 when a new CPU lineup has just launched unless you are using one of those CPUs, it is always a recipe for disaster