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You have to use triangle away whilst rooted, otherwise it won't work. So to achieve your aim you need to be rooted, then download the app either from the Play Store, as mentioned zfarishta, or download the .apk from the developers post at XDA and simply use a file manager (like ES its free) to install it by pressing on the file name - here is the link xda-developers - View Single Post - [2013.10.04][ROOT] TriangleAway v3.10.

Next, run the app and follow the instructions. Then download a stock TW ROM and flash it through Odin via your PC. After that you should have stock firmware with stock recovery and the phone status should be normal, i.e. unmodified/not custom. and it will be unrooted.
 
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