Follow these steps to reset your device through the Android recovery mode: Step 1: Ensure your Samsung tablet is powered off, If not, Then turn it off. Step 2: Press and hold the Volume Up button, Then press and hold the Side key too. Step 3: Wait until the Samsung logo appears, Then release all buttons.
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Follow these steps to perform a factory reset: Switch off your Samsung tablet. Press and hold the Volume Up, Power, and Home buttons simultaneously. Release the buttons when the Samsung logo appears. Use the volume buttons to navigate to the “Wipe Data/Factory Reset” option. Press the Power button to select the option.
Press and hold the Volume Up button and the Power button simultaneously until the Samsung logo appears on the screen. Release both buttons once the Samsung logo appears, and your device will enter recovery mode. Use the Volume Up and Volume Down buttons to navigate through the recovery mode menu options.
Once power off, power+volume down until you see the dark screen, scroll down to the option says Data Wipe + Factory reset Done couple times hope it helps. IF, you are registered owner, you can unlock it at Samsung account IIRC. To reset a Samsung Galaxy Tab A, turn your device off. Press and hold the power and volume up buttons on your device to bring up the Android Recovery screen. Select Wipe data/factory reset Technique #3 - ‘Recovery mode’ factory data reset The Recovery Mode option to reset Samsung Galaxy Tab Active Pro is useful when the approaches described above do not work for whatever reason. For example when it hangs in a boot loop and is inaccessible. How to do a Recovery Mode reset for Samsung Galaxy Tab Active Pro: . 40 15 95 252 226 95 264 45 193

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