https://wccftech.com/intel-9th-gen-core-processors-new-stepping-300-series-bios-available/

Intel is preparing a new series of 9th Generation Core processors which will feature a new stepping which has been confirmed by various motherboard manufacturers. The new processors are said to be available in the coming month with BIOS support already being rolled out on existing 300 series motherboards.

The motherboard support listings confirm that the new ‘R0’ stepping processors are coming soon and there’s already BIOS support being rolled out by major manufacturers such as ASRock, ASUS and Gigabyte. Once we get closer to the availability of the new stepping based processors, more board partners should start rolling out the BIOS support for their respective 300 series products.