I tried the beta bios, did not help with the 07 error.
Also I tried flashbacking to 7003 and then 7106 (without turning system on).
And once again with 7201 beta bios I set dram boot voltage/dram voltage to 1.35 and 2133MHz, nope, doesn't work.
I also tested disabling fast boot, NVME support and ensured everything related to CPU was set on Auto. Nope.
But the thing is system does not even try properly POST with 3700X, I mean with ryzen 1700 in, leds are flashing between white/amber (near post code display), and it takes long time to POST.
With 3700X in, power goes on, cpu fans spin, no led switchcing and then just 07.
Btw, all mem settings which I tried I also booted 1st with ryzen 1700 to ensure those work, then turned off system and swapped CPU.
<sarcastic>Hint for Asus: Start hosting annual competition who is the fastest tearing down system and putting back. I will participate as with your QA my skills are improving every day! </sarcastic>
Pfffffft the point why I decided to go for 3rd gen was to get easy performance boost without all the hassle assembling new system, reinstalling windows and software... looks like it is unavoidable and need to continue with RMA, which means I am without system week+... why can't Asus comment on anything?
CPU AMD Ryzen 1700, MB Crosshair Hero VI, MEM FlareX for AMD f4-3200c14d-16gfx