B550 ITX board won't boot with a my Ryzen 5600X.

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   There is an Asrock forum on reddit that's very informative. https://www.reddit.com/r/ASRock/
I have seen a post on there where they were able to boot to the bios on this MB with a P1.10 bios, nothing about the P1.00 bios.

For you and others in the same boat, AMD has a Short-Term Processor Loan Boot Kit for free to flash your MB to a compatible ryzen series 5000 bios.
https://www.amd.com/en/support/kb/faq/pa-105#faq-Short-Term-Processor-Loan-Boot-Kit

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MadScientist Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 17 Aug 2020 Location: TN Status: Offline Points: 483	Post Options Post Reply Quote MadScientist Report Post Thanks(1) Quote Reply Posted: 18 Nov 2020 at 11:05pm
	There is an Asrock forum on reddit that's very informative. https://www.reddit.com/r/ASRock/ I have seen a post on there where they were able to boot to the bios on this MB with a P1.10 bios, nothing about the P1.00 bios. For you and others in the same boat, AMD has a Short-Term Processor Loan Boot Kit for free to flash your MB to a compatible ryzen series 5000 bios. https://www.amd.com/en/support/kb/faq/pa-105#faq-Short-Term-Processor-Loan-Boot-Kit

Lumpybed Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Nov 2020 Status: Offline Points: 8	Post Options Post Reply Quote Lumpybed Report Post Thanks(0) Quote Reply Posted: 19 Nov 2020 at 4:50am
	Thanks for the links. I independently found the short-term processor loan boot kit and that may be the way to go. This Reddit post says that Ryzen 7 5600 + P1.00 on a B550M PRO4 isn't working: https://www.reddit.com/r/ASRock/comments/jw9f2g/asrock_b550m_pro4_p11_is_bios_bootable/. That probably doesn't bode well for the PG B550 ITX/ax

Lumpybed Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Nov 2020 Status: Offline Points: 8	Post Options Post Reply Quote Lumpybed Report Post Thanks(0) Quote Reply Posted: 19 Nov 2020 at 7:00am
	On the other hand, this post seems to indicate that the B550M ITX ac would boot to BIOS with a Ryzen 5600 and BIOS 1.00: https://www.reddit.com/r/ASRock/comments/jwbnkb/psa_if_windows_install_isnt_working_on_your_new/. I may take my chances with 1.00 when I can get my hands on a 5800.

jackson1101 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 15 Nov 2020 Status: Offline Points: 3	Post Options Post Reply Quote jackson1101 Report Post Thanks(0) Quote Reply Posted: 19 Nov 2020 at 9:12am
	After extensive troubleshooting (following all the steps at https://forums.tomshardware.com/threads/no-post-system-wont-boot-and-no-video-output-troubleshooting-checklist.1285536/) I still haven't been able to boot, POST, or get any video output (or mobo speaker beeps). I have P1.10. ASRock said I can RMA my board, or I can get the short term loaner CPU from AMD. I'm awaiting a confirmation from AMD on the loaner boot kit and intend to do that first so I don't have to risk shipping any parts to the manufacturer (and would have to pay for the shipping in the process). A little nervous that other people seem to have had success with POSTing from P1.00 and 1.10 while I haven't, though maybe it varies by motherboard model in addition to BIOS version?

123qwedsa Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 27 Nov 2020 Status: Offline Points: 1	Post Options Post Reply Quote 123qwedsa Report Post Thanks(0) Quote Reply Posted: 27 Nov 2020 at 1:46am
	Made an account to let you know that AMD might be able to help you with this: https://www.amd.com/en/support/kb/faq/pa-105#faq-Short-Term-Processor-Loan-Boot-Kit

Lumpybed Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Nov 2020 Status: Offline Points: 8	Post Options Post Reply Quote Lumpybed Report Post Thanks(0) Quote Reply Posted: 28 Nov 2020 at 12:39pm
	Same result with my B550 Phantom Gaming ITX w/P1.00 BIOS (probably) and a Ryzen 5800X: no POST. My Sapphire Pulse 5600XT lights up as expected but I don't get any video output. No beep codes, either. I've requested the AMD boot kit, we'll see how long it takes for that to arrive.

Lumpybed Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Nov 2020 Status: Offline Points: 8	Post Options Post Reply Quote Lumpybed Report Post Thanks(0) Quote Reply Posted: 29 Nov 2020 at 1:01am
	A little more fiddling/reseating got me to 5 short beeps, which is Processor Error, as best I can tell. Still seems consistent with the B500 Phantom Gaming ITX/ax with P1.00 BIOS not working with the Ryzen 5800X. I don't have my cooler yet and the CPU gets very warm in a few seconds after applying power, so I think I'm going to stop until I can get a 3000 series processor to update the BIOS.

Lumpybed Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Nov 2020 Status: Offline Points: 8	Post Options Post Reply Quote Lumpybed Report Post Thanks(0) Quote Reply Posted: 04 Dec 2020 at 4:12am
	For reference, it took about 4 business days for AMD to approve my request for a loaner CPU. It shipped today and should arrive within 5 business days. I don't have a tracking number. So if you need to go this route, budget two weeks for the whole process.

Lumpybed Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 18 Nov 2020 Status: Offline Points: 8	Post Options Post Reply Quote Lumpybed Report Post Thanks(0) Quote Reply Posted: 08 Dec 2020 at 12:36pm
	Good news: my loaner Ryzen 3100 from AMD arrived today, and I was able to use that to get into the BIOS and start the update process. So I think that demonstrates conclusively that P1.00 BIOS is not compatible with Zen 3 on this board. Bad news: they system quit abruptly about 20% of the way into the P1.71 BIOS update. I admit I didn't install the CPU cooler that came with the loaner, because I thought I could get away with running it for a couple minutes without a heat sink to do the BIOS update. Apparently I was wrong. So now I get to RMA my motherboard to ASRock so they can rescue it. Sad trombone, but kudos to ASRock support for replying to me after hours tonight to get me started in the RMA process.

MadScientist Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 17 Aug 2020 Location: TN Status: Offline Points: 483	Post Options Post Reply Quote MadScientist Report Post Thanks(0) Quote Reply Posted: 08 Dec 2020 at 11:27pm
	@Lumpybed Why would anyone even try to boot up a computer without a heat sink on the CPU and then flash the bios?? The CPU probably reached its thermal barrier within seconds and shut down your computer. I'm surprised that Asrock would even let you RMA the MB. Your CPU may also be toast.