No BIOS updates for later/newer model cpu's is/was fairly common on oem prebuilt machines also.
Check with asus support first.
My PC- Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T.