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When you copy files from bp-default into your custom BP theme, you would have to follow the directory structure as r-a-y mentioned above.

So if the file you’re copying is /bp-default/members/single/home.php then you have to copy it over to /wp-content/themes/your-custom-bp-theme/members/single/home.php – where you would have to create the /members directory and within that, the /single directory