How to get rid of ROM's boot image; odin flashing of stock firmware doesn't do it

SM-G920.

I tried renegade rom and wanted to go back to stock, but I can't seem to get rid of the boot/splash image it puts when you turn on your phone.

Is there something special I need to do when I flash stock firmware with odin?

Also, as I have sprint, should I be selected RTN for sprint? I had done that, was that bad?

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