Linux firmware is a package distributed alongside the Linux kernel that contains firmware binary blobs necessary for partial or full functionality of certain hardware devices.

Grab the latest firmware from https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git.

Drop these firmware files into /lib/firmware/ and rebuild any initramfs:

wget https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/snapshot/linux-firmware-20230515.tar.gz
tar -xf linux-firmware-20230515.tar.gz
sudo cp linux-firmware-20230515/* /lib/firmware/
sudo update-initramfs -uk 'all'

https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git