i have done the same research as posted in this link and read exhaustively every means google XDA and all the other pages dealing with rooting and flashing my AT&T s4 i337. I have ended up in the same boat as this guy with:
Baseband version - I337UCUFNB1
Build Number - JSS15J.I337UCUEMK2
i have attempted Kingo Loki, Motochopper, Odin(4 or 5 versions) adb flash in Linux(2 builds) and Winblows 7. My original desire was to have this build
https://www.youtube.com/watch?v=mJLKX_QWSpc
which got my hopes up immensely, as having wasted days upon days several times over the course of the last 9 months rooting this i337. The guy in the vid says he was able to get UT up and running following guidance from XDA. I want to be able to flash a twrp-like dual boot recovery to my device maintaining Andy functionality using UT as a daily driver.
I have read, as reading saves phones, everything I can glean from the aforementioned posts and forms, researched this thing to death and neded up with a phone with the knox-? security message listed in the original post. I have no Idea where to go from here, but know you guys do, as like a myriad of others, I worship this site like a god.
Please help an old retired disabled veteran of most of the sandy wars in the past 25 years. All I have now are my devices which bring me some comfort to my days.
I really need your help, as I've tried seemingly all and have a semi-dead i337.
buxtor, aka, Chief
You're going to have to downgrade to mk2 firmware using Odin. Then root using saferoot. Then install safestrap. Then you can flash roms. Start in the general forum and look for index, all things nb1, mk2. There's a lot of info and links there
Ps, you're not going to ut working on your device. You'll only be able to use touch wiz based roms.
Sent from my Nexus 5 using XDA Free mobile app
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