s7 edge issues

I posted about my samsung galaxy s7 edge being hacked and it's telling me to update my os. I tried to and it says my phone is up to date. is there anyway I can get an update or anything for my device. I tried everything you can possibly think of to try new keep it safe from hackers/viruses but nothing seemed to work so far. I was just wondering if there's a way I can update the os or am I pretty much screwed.. my phone is running marshmallow 6