OE1 is the latest that can keep root ONLY if you use this method to do it: http://xdaforums.com/verizon-galaxy-s5/general/how-to-update-to-g900voe1-5-0-keeproot-t3149784/. Read the threads in General...So NK7 is latest that can keep root? Any benefit to upgrading?
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Benefits? You get Lollipop 5.0. Just google the change log for each version.