Ryzen 5000 Comes to X370 via Leaked ASRock Taichi Alpha BIOS (Updated) | Tom's Hardware
Ryzen 5000 Series Processor Support Comes to ASRock X370 Motherboards in Leaked BIOS Update | TechPowerUp
Bootleg Firmware Brings Ryzen 5000 Support to ASRock X370 Motherboards | Tom's Hardware
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
AMD Ryzen 5000 Support Comes to A320/B350/X370 ASRock Motherboards | Hardware Times
AMD Ryzen 5000 Series support added for ASRock X370 motherboards