For those of you looking to update to the latest Android operating system on your S5, you need to take a look at the latest Android Nougat 7.1 ROM . Based on latest Android 7.1, this ROM brings you the latest CM and lot of customizations.
Out of the box, you will get all of the latest Android Nougat features along with , CM themes (compatible with all CM14 themes), and more.
Download Nougat ROM from the XDA Post
Download Gapps Use ARM
Please Follow the Instructions carefully and if you have any doubts ,watch the video carefully!