[HELP!] Upgraded to 6.0.1 and cannot downgrade back to 5.02 or 5.1.1

I stupidly upgraded last night and wasn't completely ready to but did it anyway and I want to go back. I have G925T - T mobile S6 EDGE.

I keep trying to flash the stock rom via Odin and it keeps failing with a binary error. I know I have the correct stock firmware "G925TUVU1AOCG". Tried it while rooted, using smartswitch to put back stock 6.01 and nothing works :(:( any suggestions?

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