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I do notice your still running the old (3 updates old) NG5 baseband. You may want to look into the available updates.. i know the NC6 update gives you wifi calling.. useful.. considering the triband device cant call and surf webpages at the same time.. lol
I tried the rooting methods listed in the thread that you linked. It still won't root. Any ideas? Thanks!Here is the most complete post I've ever found on the l720t s4 from sprint.. it has the correct modstrings and all relevant info to complete your root.... link... http://forum.xda-developers.com/showthread.php?t=2621862