ASUS gets asked about BIOS updates for X370 to support Ryzen 5000 similar to ASRock, they reply by saying that there is no official support not even from ASRock, when presented with
Ryzen 3900x on X370??? - YouTube
Amazon.in: Buy (Renewed) MSI X370 XPOWER Gaming Titanium AMD Ryzen X370 Ddr4 Vr Ready Hdmi USB 3 ATX Gaming Motherboard Online at Low Prices in India | MSI Reviews & Ratings
For AMD X370 AM4 Ryzen CPU For ASUS ROG CROSSHAIR VI HERO Motherboard Computer Socket AM4 DDR4 Used Desktop Mainboard|Motherboards| - AliExpress
ASRock > X370 Taichi
AMD RYZEN 3 1300X Gaming Upgrade Kit - Best Deal - South Africa