You may use linux pipe function to copy the output of a given command into a file and transfer it with an usbstick to another device, so you can post it completely:
eg:
lspci -nn > lspci.txt
------------------------------------------------------------
Your device should work with the build-in driver, given you have installed firmware-iwlwifi -you don't have to download/install the driver manually.
So, given you have a wired connection enabled, do as root:
activate the non-free repo in your /etc/apt/sources.list.d/debian.list by appending non-free to the following line:
deb http://http.debian.net/debian/ unstable main contrib non-free
then
apt-get update
apt-get install firmware-iwlwifi
modprobe -rv iwl3945
modprobe -iv iwl3945
No wired connection:
Download the firmware from one of the here listed mirrors: https://packages.debian.org/sid/all/firmware-iwlwifi/download (https://packages.debian.org/sid/all/firmware-iwlwifi/download)
then cd into the given directory :
dpkg -i firmware-iwlwifi*
modprobe -rv iwl3945
modprobe -iv iwl3945
Start network-manager configuration or ceni.