need help install twrp on SM-G850F

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hello,can anybody tell me how to install twrp on my alpha?i have tryed odin to flash "twrp-3.1.1-slte-2.tar.md5" but it stuck on: Odin engine v(ID:3.1207).. File analysis.. SetupConnection.. Initialzation.. Get PIT for mapping.. Firmware update start.. NAND Write Start!! SingleDownload. twrp-3.0.3-0-slte-1.2.imgthank youmichael