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x370 fatal1ty K4 bios 7.03 for 5600x reboot loop

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goathens View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote goathens Quote  Post ReplyReply Direct Link To This Post Topic: x370 fatal1ty K4 bios 7.03 for 5600x reboot loop
    Posted: 17 Apr 2022 at 8:23am
After getting a great deal on a 5600x cpu, I replaced my 1700x in my X370 Fatal1ty gaming K4. I ran all the bridge bios upgrades 3.5 --> 5.1 --> 7.00 then applied the 7.03 beta bios. All good, windows still booted between each update, although the PC speaker beeps in a different tone now.

I swapped the cpu (removed 1700x, installed 5600x), now the system goes into a reboot loop.
Dr. Debug flashes codes:
33, 43, 7A, 60, 66 (power cycles after 66 code)

I unplugged, pulled the CMOS battery, no change.

Yanked all the USB devices, no change.

Any ideas? I'm running some older G.Skill 2400 fortis ram (amd-specific for ryzen gen1)
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RLGL View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RLGL Quote  Post ReplyReply Direct Link To This Post Posted: 17 Apr 2022 at 9:14pm
Google search found:
What does 66 mean on motherboard?
Code 66 is often the system not able to find your OS.
Try a repair of the boot sector.
Asrock Z370 Gaming K6,Intel i7 8700K,
Asrock x570 Taichi

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neoset View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote neoset Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2022 at 4:51am
Have you fixed the problem yet?
I have the same board and wondering if I could upgrade the CPU to 5800x
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Xaltar View Drop Down
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Post Options Post Options   Thanks (2) Thanks(2)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2022 at 4:54am
Unfortunately a lot of people never come back and post when they fix their issue.
Usually it means they fixed the problem but we have no way of knowing if it was
thanks to the advice in their thread or they found another solution.

You should be able to upgrade to a 5800x on your board however, it is officially
supported. You can also post back here (in a new thread of your own) if you have
any problems. Even if you have issues you can find help here or make a ticket with
ASRock's Support staff. Someone will be able to help resolve any issue you have.
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neoset View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote neoset Quote  Post ReplyReply Direct Link To This Post Posted: 31 May 2022 at 5:12am
I read there are some problems with 7.03 bios on other x370 boards, like bootloops with 4 ram sticks. But for this board - Fatal1ty X370 Gaming K4, 7.03 is the last beta - there is no 7.10 or 7.20 yet...
Probably will not be able to go back to older stable bios if this one is causing problems with the memory or something.
That is why I'm searching for confirmation that it will work.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elkadillo Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2022 at 2:37am
I'm having exactly the same issue on the Fatal1ty X370 Gaming Pro
Using Trident Z memory 32000hz
Works fine with my Ryzen 1700 but when I install my 5800X I get the same exact debug codes with the same power cycle reboot loop.


Have you figured out the issue? I've been troubleshooting for around 10 hours already including reinstalling Windows. No luck so far.
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neoset View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote neoset Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2022 at 2:44am
Originally posted by Elkadillo Elkadillo wrote:

I'm having exactly the same issue on the Fatal1ty X370 Gaming Pro
Using Trident Z memory 32000hz
Works fine with my Ryzen 1700 but when I install my 5800X I get the same exact debug codes with the same power cycle reboot loop.


Have you figured out the issue? I've been troubleshooting for around 10 hours already including reinstalling Windows. No luck so far.


Are you using 7.10 bios?
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Elkadillo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elkadillo Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2022 at 2:51am
Yes, I must've re-flashed liked 7 times to make sure. Was successful every time and shows I'm running 7.10
Boots fine with 1700 but nothing with 5800X
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Elkadillo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Elkadillo Quote  Post ReplyReply Direct Link To This Post Posted: 16 Sep 2022 at 6:14am
Hi, so I figured I'd reply to you since the post owner went mia.

I had the same issue. Switched from using Gskill TridentZ ram to Corsair Vengeance and everything is working now.
Very weird
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