Ellis Taylor scored twice for the hosts at Eppleton CW, with his first coming from the penalty spot, before a stunning strike six minutes before half time.
Lee Burge started in goal for Sunderland while three trialists also featured in the Premier League 2, Division 2, clash.
The Black Cats have one league game remaining this season and will face Southampton next week.
Here’s how each player fared for the hosts against Birmingham:
The Black Cats have one league game remaining this season and will face Southampton next week.
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