The Gigabyte B450M DS3H v2 comes with BIOS version 2.0
The Gigabyte B450M DS3H v2 comes with BIOS version 2.0
I'm testing it with a Ryzen 5 3600 and it works with BIOS F1 and newer, but I can't see the exact BIOS version. The memory spec lists support for DDR4 3600 modules, so a 3000MHz kit shouldn't fit unless it's an older model. Check your motherboard's documentation for the BIOS version.
Inquire with the seller. It should have the Ryzen 3000 ready on the package. By now, most will be available for models supporting 3000 chips unless you obtain older inventory.