https://www.techpowerup.com/254634/msi-betrays-amds-socket-am4-longevity-promise-no-zen2-for-300-series
 
Greedy motherboard vendors such as MSI want you to buy a new motherboard every two generations of processor for no sound reason at all. MSI is reportedly blocking support for 3rd generation Ryzen "Matisse" processors on its AMD 300-series chipset motherboards, including those based on high-end AMD X370 and OC-capable B350 chipsets. This would also put those who own $300 motherboards such as the X370 XPower out of luck.
 
This normally should mean that any 300-series motherboard must support 4th generation Ryzen processors with a simple BIOS update. Most 300-series motherboards, including from MSI, even ship with USB BIOS Flashback feature to help with forwards compatibility. Unfortunately, motherboard companies such as MSI care more about their bottom-lines than the consumer. In a support e-mail to an X370 XPower Titanium owner, MSI confirmed that it will not extend Zen 2 support to AMD 300-series. 
 
Yes this sounds like greed to me

rjohnson11
https://www.techpowerup.com/254634/msi-betrays-amds-socket-am4-longevity-promise-no-zen2-for-300-series
 
Greedy motherboard vendors such as MSI want you to buy a new motherboard every two generations of processor for no sound reason at all. MSI is reportedly blocking support for 3rd generation Ryzen "Matisse" processors on its AMD 300-series chipset motherboards, including those based on high-end AMD X370 and OC-capable B350 chipsets. This would also put those who own $300 motherboards such as the X370 XPower out of luck.
 
This normally should mean that any 300-series motherboard must support 4th generation Ryzen processors with a simple BIOS update. Most 300-series motherboards, including from MSI, even ship with USB BIOS Flashback feature to help with forwards compatibility. Unfortunately, motherboard companies such as MSI care more about their bottom-lines than the consumer. In a support e-mail to an X370 XPower Titanium owner, MSI confirmed that it will not extend Zen 2 support to AMD 300-series. 
 

 That's okay MSI. I have an answer for that
 

 

If I bought a Zen 2 which is highly likely I would not want to pair it with a 300 or 400 series board even if I had one in use. For that matter for every iteration of Intel procs a new board was required 95% of the time over the last 20 year so I don't see the big deal. Stifling innovation to remain backward compatible is what got AMD in trouble to begin with and I for one would hate to see that happen again. I Do not know if it's Intel fanboys trolling or spoiled AMD boyz posting here, but either way there is a clear reason why there will be no backward capability and that’s power delivery required for the Zen 2. Even if a bios update is possible I would only do it temporarily and my expectations would be low. Who would want to buy a new proc and risk not supplying proper power to save a few bucks. Makes no sense to me. Plus, the 500 series chipset will be an in house chip with licensed support from Asmedia. Considering everything else AMD has done I can't wait to see how it turns out. I'd bet the new chipset will be worth upgrading your old stuff to and the question worth considering would be if its backward compatible with 2700x.

owcraftsman
If I bought a Zen 2 which is highly likely I would not want to pair it with a 300 or 400 series board even if I had one in use. For that matter for every iteration of Intel procs a new board was required 95% of the time over the last 20 year so I don't see the big deal. Stifling innovation to remain backward compatible is what got AMD in trouble to begin with and I for one would hate to see that happen again. I Do not know if it's Intel fanboys trolling or spoiled AMD boyz posting here, but either way there is a clear reason why there will be no backward capability and that’s power delivery required for the Zen 2. Even if a bios update is possible I would only do it temporarily and my expectations would be low. Who would want to buy a new proc and risk not supplying proper power to save a few bucks. Makes no sense to me. Plus, the 500 series chipset will be an in house chip with licensed support from Asmedia. Considering everything else AMD has done I can't wait to see how it turns out. I'd bet the new chipset will be worth upgrading your old stuff to and the question worth considering would be if its backward compatible with 2700x.

The thing is we know this is smeg, I mean for frell sake you could in theory run a intel i9 9900K in a Z170 motherboard, heck i have seen it done!
 
https://www.youtube.com/watch?v=dMdwjZhUO_g
 
This is money grubbing on MSI's part and I hope they get zero tolerance.
I mean I understand not doing it for b350 but Z370 is higher end and there is no reason to not support zen 2 on that platform.
It becomes even more nonsensical when some asus B350 motherboards are said to support zen 2