Hi @memnoch_proxy,
I have a similar problem as you, also need a BIOS that is not on their site to download to support my CPU. Support is not responding to my message. Could you please send me the creds via DM?
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next time get time on this build I’ll be using my label maker to mark the port names and be using enp4s0.
I’m really glad I found your thread! Contacting ASRock now for those ftp creds so I can get my B650d4u working with a 9700x cpu
Do you mind sharing it with me as well? Unfortunately I get no answer from support. I’m looking for a BIOS Update for the B450D4U-V1L to support newer CPUs and unfortunately I can’t find anything for this board
I updated to BMC firmware 5.03, then I reset my login password and upgraded BIOS to 20.05
I’m trying to build a machine with B650D4U motherboard and a Ryzen 9900X, so I’m glad to see someone got something working with a 9000 series Ryzen. I’m curious though, you mention BIOS version 20.05, but the latest I see on the downloads page is 20.02. Is 20.05 only available through the FTP site or did you mean 20.02 here? Thanks!
Follow Up
I built two of these machine and I was hoping that some less expensive 4800MT sticks would work…and they didn’t. This chipset appears to suffer similar finicky behavior with RAM that other people find with the B650 chipset. Possibly it is Hynix A-cell chips?
I was able to boot with 128GB of Kingston Fury X, but unable to boot with Nemix/Gigastone 4800. I had to go back to the memory QVL and am waiting for some listed ECC sticks.
The DR Debug codes for this would vary from hanging at EC to 00, not getting to a proper post screen. It would attempt to re-train but would ultimately hang indefinitely.
It likes VGA
Booting with the HDMI connected does not give you as much BIOS information as the VGA port gives you on boot.
USB is sparse
If you plan to use a pump, you only have one USB header on the board. It’s possible, but you’ll feel like you’re missing something.
It likes the 7950X
If you need a 9000 series, definitely upgrade the BMC and UEFI.
IPMI on LAN1 …
While its theoretically possible to get IPMI on LAN1 (rather than the IPMI port) You won’t get any IPMI if your RAM does not train up 
Overclocking
It seems to boot fine with a naive PBO enabled, motherboard limit, x7 scale setting. However, I’m sure I would benefit from typing in a curve modifier, but I have no idea what units I’m typing in! A consumer mobo is so much easier to OC.
Please post if you have any advice on what to set in the curve settings 