Hi Andrew,On my Dell 5510 the Wi-Fi is working only after installing firmware-iwlwifi from debian non-free:
wget http://ftp.fr.debian.org/debian/pool/non-free/f/firmware-nonfree/firmware-iwlwifi_20200918-1_all.deb
dpkg -i firmware-iwlwifi_20200918-1_all.deb Kind regards, Eugen