HELP | Downgrade from version 5.1.2.1 to version 5.1.1.

Hi, I need help. Recently bought my Amazon Fire 5 gen. I'm trying to remove the Fire OS and install the CM 11. However, by inattention, I downgraded from version 5.1.2.1 to version 5.1.1. Now my Fire is no longer booting. Is there a solution?

Thanks.

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