Uninstall G900T and install G900A - Possible?

I have an unlocked T-Mobile S5 (SM-G900T) but i am turning into AT&T and want to install SM-G900A on it to get the AT&T default applications and start up screen. Is there a way to do it?

I tried using ODIN, attached PIT file and G900A.tar.md5 but the phone says "SECURE CHECK FAIL : PIT"

Can any one help please.

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