Help please! I need to return to stock firmware for G935AUCU1APB4.

Hello everyone. I have root, but it is keeping me from getting updates, and I would like to receive updates. I have
an AT&T Samsung Galaxy s7 edge with an SW-VER of : G935AUCU1APB4. I know how to use odin, but I am having trouble
finding the correct stock firmware. Any help would be greatly appreciated.

Thank you.

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