SIOCSIFFLAGS: No such file or directory

iwl3945 0000:05:00.0: iwlwifi-3945-2.ucode firmware file req failed: -2
iwl3945 0000:05:00.0: iwlwifi-3945-1.ucode firmware file req failed: -2
$ wget http://intellinuxwireless.org/iwlwifi/downloads/iwlwifi-3945-ucode-2.14.4.tgz
# tar zxf iwlwifi-3945-ucode-2.14.4.tgz
# cp iwlwifi-3945-ucode-2.14.4/iwlwifi-3945.ucode /lib/firmware/

edit: the newer code needs the ucode to be numbered, its actually the same ucode, but just with a different file name, so if you get this error iwlwifi-3945-1.ucode firmware file req failed: Reason -2

then just run the following command.

# cp /lib/firmware/iwlwifi-3945.ucode /lib/firmware/iwlwifi-3945-1.ucode







iwl3945 0000:05:00.0: iwlwifi-3945-2.ucode firmware file req failed: -2
$ wget http://intellinuxwireless.org/iwlwifi/downloads/iwlwifi-3945-ucode-15.32.2.9.tgz

$ tar zxf iwlwifi-3945-ucode-15.32.2.9.tgz
# cp iwlwifi-3945-ucode-15.32.2.9/iwlwifi-3945-2.ucode /lib/firmware/



Reference :
Installing iwlwifi with a debian kernel - Foomagic
Intel® Wireless WiFi Link drivers for Linux*