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Does this help?
PRIME Z270-K BIOS & FIRMWARE| Motherboards | ASUS USA
Does this help?
PRIME Z270-K BIOS & FIRMWARE| Motherboards | ASUS USA
By the way, some PC owners, those with "Off the shelf" PCs, like laptops, workstations, and so on, might not even get the needed BIOS update.
A good example, my Lenovo H530, that originally came with Windows 8.1, hasn't had a BIOS/UEFI update since NOV 17th, 2016, and most drivers hav't been updated(from Lenovo) in there last 2 years either.
So don't be surprised if the OEMs have stopped supporting your equipment.