Originally Posted by fgr
You could try booting into recovery. Might get lucky and they installed twrp or cwm recoveries. I have no clue what the stock recovery would do. That's the first thing to get replaced when I get something new.
You could do a little poking around with adb shell possibly then.
might give that a try
the person i bought this phone from had 3 other sprint (not near as good) phones i also bought as a package
i think she worked at radio-shack or something because she said something about customer warranty stuff or something
anyhow each phone had something wrong with it
sold the other 3 which basically paid for the S4 for $100
so yea long story short. its some customers phone for sure which mean it could be custom.
need to check it out tonight probably