No knox status in ODIN mode? Need to warranty rooted i537
So I bought this i537 used a while back, the previous owned never registered it with samsung but I did when I bought it so I do have a warranty on it. I know it was previously rooted then unrooted before I bought it but I don't know if it ever had a custom rom on it. I rooted the phone with activeroot (still on 4.2.2 stock rom) and have since unrooted it with superSU.
I am having problems with the touchscreen and samsung has confirmed warranty coverage and gave me a shipping label but I want to be totally sure it a-ok before I send it in.
When I boot into odin mode there is no KNOX status, is that normal for this device? Did 4.2.2 not come with knox on this device?
Also the status says custom? When the phone WAS rooted it said official ??? seems bass ackwards.
Also, I would like to reload stock 4.2.2 via ODIN just to make sure everything is kosher before sending it it, would this void my warranty?
My phone is also sim unlocked, i imagine this is okay as far as warranty goes? Would reflashing with ODIN break my sim unlock?
Thanks so much!