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Samsung P7100 Galaxy Tab hard reset
Your device freezes or has fatal errors
If your device freezes or hangs, you may need to close programs or reset
the device to regain functionality. If your device is still responsive but a
program is frozen, close the program using the task manager. If your device
is frozen and unresponsive, press and hold [POWER ] for 8-10 seconds. The device
will reboot automatically.
If this does not solve the problem, perform a factory data reset. In Menu
mode, select Settings → Privacy → Factory data reset → Reset Tablet→
Samsung GT-P7100 Galaxy TAB hard reset with keys
With the Samsung Galaxy TAB turned off, press and hold the VOLUME UP button, and then briefly press the POWER button. In recovery menu select wipe data / Factory reset using Volume button.
Note: If you see "Downloading" on the screen with an Android shoveling you pressed the wrong Volume key. Remove and reinsert the battery and try again.