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Samsung S5 Active Not updating


AC Question

New to the Forum but hoping that someone can help me.
I have a Samsung Galaxy S5 Active which I purchased off Amazon Unlocked. It is an At&t phone but I am using it in Canada on the Bell Network. I have been unable to get any updates and therefore am still running Kitcat 4.4.2.

I have downloaded the Bell Firmware but Keep Getting the Error Message "Secure Check Fail Aboot" Immediately after each attempt to install with Odin.

I have not been able to find an updated At&t firmware to load and as far as I can tell the Bell Marshmallow Update won't work because My Build version is G870AUCU1A..... Where as the Bell Build Version is G870WVLU1C.......

Is there a way to install this Bell Firmware on my phone ?