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Why do I see red exclamation mark on the top left corner of Samsung Galaxy Tab E 9.6 after downloading custom OS?

I downloaded custom os in sm t-561 and when I am restarting it it has a red exclamation mark in the top left and nothing is happening. Why?

When you pull down the notification bar, does it say show any error about the exclamation mark? Also, it will be best to inquire to the group using the custom OS or better direct to the person who made the custom OS.

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