Upgrade path for NVR and cameras

I've got a DS-7608NI-SE/P running firmware V3.0.22 build 170621 and cameras DS-2CD2032-I running v5.0.2 build 130805 but I can't upgrade them. I'm not actually sure there IS a more up to date firmware for the NVR but I know there is for the cameras but no matter what upgrade file I choose the web GUI won't have it...

thanks!!