I can't flash the stock firmware onto my Samsung Galaxy S4.

[parkourcannibal]

Hello, all! I was given a Samsung Galaxy S4 (Sprint version) by a friend who recently upgraded, and apparently he had tried installing CyanogenMod. Upon booting the phone, I was given the Set Warranty Bit: Kernel error.

So, I decided to unroot the phone and try to get it back to the stock firmware. I've followed every step and done everything correctly, but Odin keeps getting stuck. I'll include its log for reference.

<ID:0/005> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/005> Odin engine v(ID:3.1203)..
<ID:0/005> File analysis..
<ID:0/005> SetupConnection..
<ID:0/005> Initialzation..
<ID:0/005> Get PIT for mapping..
<ID:0/005> Firmware update start..
<ID:0/005> SingleDownload.
<ID:0/005> aboot.mbn

Is there any advice anyone can offer? I'm using an original USB cable, I have the Samsung drivers installed, and I've tried using every USB port I have.

Thanks so much in advance.