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Evo GMT-4 will not program for 2008 GMC Sierra 2500 Diesel

I purchased an EVO GMT-4 for installation in a 2008 GMC Sierra SLT 2500 HD. After instalation of the unit with the T-Harness, I attempted to program the unit. I followed the directions, but after I turned he key, instead of the blue light flashing, it just turns of and stays off. I attempted the programming several times to no availl It came with: Hardware Vr. 6 Firmware Vr. 70.16 Date: 11/2016 EVO-GMTx Preloaded

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