I initially tried from the stock branded rom but I couldn't pass the first page in *#0011#. So I decided to debrand it using a Samsung stock fw I337MVLUEMK6.
Unfortunately even with the debranded rom I have gotten the same result, unable pass the first page in *#0011# no matter how many times I would hit back, and the option 1 or whatever makes no difference.
At that point I stumbled upon this thread and I decided to give it a shot, however no go with this method either, probably wasn't even the point of my situation.
So at this point my questions are, is there another method beside buying an unlock code to get this phone unlocked? If anyone of you who has had luck unlocking the phone with this method would pass me it's HiddenMenu.apk, would it work if I sideload it onto my gf's S4?