Model: SGH-I337Z (AIO prepaid)
Whats in included: Platform, bootloaders, modem, CSC. Each one can be flashed individually via Odin I assume.
Warning do not mess with the bootloader files or anything else if you don't know what you're doing!
° an AIO Samsung Galaxy S4 (SGH-I337Z).
Steps to go back to stock on an I337Z
1. Open Odin 3.07
2. Click on PDA slot to select the file platform I337ZTUUAMH1.
3. Put phone in download mode and connect it via USB.
4. Once you see your com port light up via Odin program click "Start".
5. Wait for Odin to successfully restore your AIO I337z back to stock!
Thanks to @DeANgelo130 for letting me use his device information to get this firmware out here on Xda.