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got told to crosspost over here to reach more people:
(kbin.social)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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It's likely the mobo. A Ryzen processor and a nvidia 3070 isn't so uncommon. And you already said you updated the BIOS and put quite an amount of effort in.
If you can return it or have a friend in need of a mobo... I'd swap it... However, there is still a possibility that someone reads your post on the weekend and happens to know something more. Or you use Linux in a VM from within Windows. That may work, I don't know you, I wouldn't do it since I use Linux 99% of the time.
Only thing I would advise against is hoping the issue will someday get fixed. In many cases it never happens.