1) What does trip Knox mean? Im a noobie
2) I would rather use my phone with no warranty than to ever install Lollipop again! you don't understand how happy I am that I'm back on my Kit Kat, the OS that I bought the phone with and was super happy with at the time. Then came the lollipop and spoiled my smoothness, my battery life, everything!!
3) In all the years I have owned phones, I never ever used warranty, warranty is for n00bs no offense who don't know how to install an OS / software. But usually, in my case, my phone always worked fine, software wise I can figure it out on forums. I have a Ballistic Case to protect the phone with a glass screen protector and even if I didn't, warranty wouldn't cover physical damage so. IMHO warranty is overrated
Trip Knox means it shows you rooted it, even if you flashed it back. Many times Samsung won't even touch it, with you paying, if you trip Knox.
Also it means, the free flash that Samsung Experience, Samsung and some carrier warranty stores will do, they won't even flash for you if you have tripped Knox, and some of them check.
Actually warranty is to cover things that should be lasting a year or longer lol.
My N3 had to go into repair for warranty, the motherboard went out. My N2 had to be traded in under warranty, the SIM card reader stopped working.
That had nothing to do installing anything.
Years ago, my first Android wouldn't even turn on after T-Mobile forced a Froyo update on me. That had to be replaced under warranty.