x370 SLI BIOS upgrade to 4.5. No Post now.

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   I had a windows 10 installation working on an X370 SLI motherboard. I updated the bios using usb stick and instant flash to version 4.5. After the update, I pressed the 'enter' key to restart.  The computer never gets past the BIOS post screen.  The ASRock logo is on the screen and the options are listed in the bottom right corner but none of the keystrokes work.  The logo stays and won't boot to Windows anymore.  I have removed video card (to go back to just on board vga).  I have cleared CMOS a few times. I have allowed it to sit for an hour...still stays on the BIOS post screen.  I can press ctrl-alt-delete and the computer will cycle. Any help or suggestions would be appreciated.

Is there a way to downgrade the bios? I don't need to use the latest version.  Version 3.5 was working just fine. But if I can't get into the bios setup...how will I flash the bios?

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busyuqboy Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Feb 2018 Status: Offline Points: 6	Post Options Post Reply Quote busyuqboy Report Post Thanks(0) Quote Reply Topic: x370 SLI BIOS upgrade to 4.5. No Post now. Posted: 24 Feb 2018 at 1:16pm
	I had a windows 10 installation working on an X370 SLI motherboard. I updated the bios using usb stick and instant flash to version 4.5. After the update, I pressed the 'enter' key to restart. The computer never gets past the BIOS post screen. The ASRock logo is on the screen and the options are listed in the bottom right corner but none of the keystrokes work. The logo stays and won't boot to Windows anymore. I have removed video card (to go back to just on board vga). I have cleared CMOS a few times. I have allowed it to sit for an hour...still stays on the BIOS post screen. I can press ctrl-alt-delete and the computer will cycle. Any help or suggestions would be appreciated. Is there a way to downgrade the bios? I don't need to use the latest version. Version 3.5 was working just fine. But if I can't get into the bios setup...how will I flash the bios?

wardog Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 15 Jul 2015 Status: Offline Points: 6447	Post Options Post Reply Quote wardog Report Post Thanks(0) Quote Reply Posted: 24 Feb 2018 at 1:53pm
	What BIOS rev did you upgrade to 4.50 from?

busyuqboy Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Feb 2018 Status: Offline Points: 6	Post Options Post Reply Quote busyuqboy Report Post Thanks(0) Quote Reply Posted: 24 Feb 2018 at 9:27pm
	Upgraded from 3.5

busyuqboy Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Feb 2018 Status: Offline Points: 6	Post Options Post Reply Quote busyuqboy Report Post Thanks(0) Quote Reply Posted: 27 Feb 2018 at 1:44pm
	So I am dead in the water for days now. Any ideas on how to get the x370 Killer SLI motherboard to boot with v4.5 BIOS? Still won't get past the BIOS post (ASRock logo). If there is no way to fix this BIOS issue, how can I return the motherboard? I've owned it for less than a month.

wardog Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 15 Jul 2015 Status: Offline Points: 6447	Post Options Post Reply Quote wardog Report Post Thanks(0) Quote Reply Posted: 27 Feb 2018 at 2:05pm
	Being less than 30 days, return or exchange it from the reseller.

busyuqboy Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 24 Feb 2018 Status: Offline Points: 6	Post Options Post Reply Quote busyuqboy Report Post Thanks(0) Quote Reply Posted: 27 Feb 2018 at 4:23pm
	Okay will do. Thanks.

deskok Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 28 Feb 2018 Location: Singpaore Status: Offline Points: 2	Post Options Post Reply Quote deskok Report Post Thanks(0) Quote Reply Posted: 28 Feb 2018 at 6:05pm
	I am having problem after upgradethe bios to 3.5, not even 4.5 yet. The Mobo keep rebooting by itself every 10 second, can't even see the ASROCK word How to roll back? Help please.
	des

MisterJ Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 19 Apr 2017 Status: Offline Points: 1097	Post Options Post Reply Quote MisterJ Report Post Thanks(0) Quote Reply Posted: 01 Mar 2018 at 2:26am
	deskok, what method did you use for updating BIOS/UEFI? If you used Windows, then it may be a bad flash. You should use only Instant Flash. I would suggest you flash to 3.5 again using Instant Flash. Enjoy, John.
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