I have after Turris OS update problem, that is not possible to install kmod-iwl4965 driver. The reason is, that missing iwl4965-firmware. Solution is dowload firmware-nonfree_0.43.tar.gz (http://ftp.debian.org/debian/pool/non-free/f/firmware-nonfree/) and copy file iwlwifi-4965-2.ucode-228.61.2.24 iwlwifi-4965-2.ucode to /lib/firmware and rename to iwlwifi-4965-2.ucode. Last operation is install package kmod-iwl4965 by opkg install kmod-iwl4965 --force-depends and restart. Also check, that missing only iwl4965-firmware if not install this package(s) namualy.
Noted Debian package is not ideal too. After two week it seems that wifi client random crash, I haven’t much time to investigate more. But crash was written at log and reboot help.