Just found this by changing the numbers on the supportlink for ASUS Prime B350 Plus https://dlcdnets.asus.com/pub/ASUS/mb/SocketAM4/PRIME-B350-PLUS/PRIME-B350-PLUS-ASUS-4602.zip? But I havent tried it yet. Edit: Just flashed it, seems to be working okay. I can now run my ballistix elite 3466 at advertized speed, nice! You wont find it using the BIOS update over internet, you have to d/l it from my link.