Stuck on TWRP logo (loading screen).

Hey guys,

I was trying to root my Samsung Galaxy S7 when something went wrong.
I'm currently stuck on the TWRP loading screen and I've tried to flash back to stock firmware but whenever I load the image into Odin it gets stuck on:
<ID:0/003> SetupConnection..


I downloaded the Firmware from here:
http://ift.tt/2aHixeu

I've tried:
- Reinstalling Samsung drivers
- Different USB port
- Different cable

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