nixCraft published a tutorial about how to configure Intel Wifi on Debian Linux when you get firmware: failed to load iwlwifi-8265-36.ucode error
How to configure Intel WiFi on Debian when firmware load failed
Explain how to configure Intel WiFi on Debian Linux 10 or 11 by loading the missing firmware and get an IP address using DHCP.
How to configure Intel WiFi on Debian when firmware load failed - nixCraft