gigabyte z370 aorus gaming k3

Hello all, I am planning to upgrade my storage, so i am looking for M.2 NVMe SSD, but i am not sure how it exactly works and if on my motherboard i can fully use (PCIe x4) mode for it. I am confused... My rig specs below : i5 8600k, 4.5GHz @ 1.2v, delided. Gigabyte Z370 Aorus Gaming K3...

I have been wanting to buy an i5-9600K and a Gigabyte Z370 AORUS Gaming K3 motherboard to go with it, but the issue is that it needs a certain BIOS version (F10) to support 9th gen CPU's. As i dont have a coffee lake CPU just lying around i would have to update my BIOS in another way. Would it...