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I was checking my Netegear Nighthawk router and it says new firmware update available, should i do it if everything is working good? I did a update on another router a few years ago, and it messed every thing up, I don't want to do that again! What do you think?

I am very new to this stuff, I had a system installed about 6 years ago and some cameras went bad and replaced some. Now my NVR is down, the guy that installed it don't want to come and fix it anymore. I have POE cables all ready run and I would like a 6 camera system that Plug and Play, like I...