Driver installation NVIDIA GeForce 940-mx not possible

This is a really specific question, I have come here before because of it but now I really think I am out of options and trying to see if anyone has experience with this specific video card. Have tried to install the drivers for it 4 times in the past and nothing has worked. First time with the .run available in their webpage, nothing happened because an error appeared. Then tried using nvidia-detect but it didn't detect anything. So I added the non-free path to download nvidia-driver, nvidia-smi and nvidia-xconfig packages. The first time I ran them only having installed bumblebee but not bumblebee-nvidia so system wasn't bootable after restarting, had to purge everything of nvidia's and restore /etc/X11/xorg.conf to blank (original state), filed a bug report as someone in here recommended and they told me I needed bumblebee-nvidia for it to work. Downloaded bumblebee-nvidia, downloaded all those packages again and the system wouldn't boot after restarting, again. Then tried again with the package from NVIDIA's webpage, this time without a graphics interface since it required that, and system crashed again. **For all those 3 times that the system crashed I had to purge everything nvidia related and restore to blank the xorg.conf file and then type startx to have graphical interface again. Next I tried what Debian's official page says , basically get things from backports, followed the steps to the line and it wouldn't boot again after restarting, purged everything I installed and everything nvidia related and it wouldn't boot having used the same fix I had done the previous times. A kind heart told me I had to reinstall nouveau for it work again, and it did after doing that. Can you please help me on how I could install this specific video card's driver? I have tried everything I have found online and I don't know enough to make up solutions as I go. I can't change the brightness of the screen, can't connect extra monitors, can't use redshift (my eyes are sensitive) and can't even invert colors because of the lack of the driver. Previously asked question here on the site Bug Report with more information Using Debian 8 with Gnome 3, my computer has two video cards an intel (integrated) and the NVIDIA card. Please tell me if more information is required. --------------- Edit: to put the results of the comment $ sudo apt-get install bbswitch-dkms intel-microcode firmware-linux-nonfree bumblebee bumblebee-nvidia primus primus-libs primus-libs:i386 linux-headers-$(uname -r) nvidia-driver Reading package lists... Done Building dependency tree Reading state information... Done bbswitch-dkms is already the newest version. bbswitch-dkms set to manually installed. primus is already the newest version. primus-libs is already the newest version. primus-libs set to manually installed. bumblebee is already the newest version. Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: bumblebee-nvidia : Depends: bumblebee (= 3.2.1-7) but 3.2.1-13~bpo8+1 is to be installed E: Unable to correct problems, you have held broken packages. Then did sudo apt-get -f install just in case and it didn't remove or install anything.