The is more than a utility; it is a declaration of ownership. For a device like the Tab E, which has long been abandoned by official manufacturer updates, this file provides a second life, allowing it to run modern software and remain functional in an era of rapid obsolescence.
You forgot to enable “OEM Unlock” in Developer Options. Boot back into the OS, toggle OEM Unlock (if grayed out, connect to Wi-Fi and wait 7 days—a Samsung anti-theft measure), then re-flash. Twrp-3.0.2-1-sm-t560.tar
TWRP 3.0.2-1 allows you to back up the EFS partition (though rare on Wi-Fi models). Go to Backup > Select Partitions > EFS (if visible) – this holds your Wi-Fi MAC address. The is more than a utility; it is a declaration of ownership