[Completed] I need help with my Samsung Tab 4 - XDA Assist

I rooted my Samsung Tab 4 when it shut down and turned back on again I got a message saying system software not authorized by AT&T has been found on your tablet I tried using Odin to flash my stock firmware but it failed immediately and leaves me stuck in download mode i've never done something like this before and I'm not sure what I'm doing wrong anyone know how fix this?

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Galaxy Tab 4 Q&A, Help & Troubleshooting
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