Introduction
If you forgot your lock screen pattern, PIN and you can't enter the menu with your google account, you can perform a Factory Master reset.
!!! This will erase all your personal data (phone book, accounts, pictures, etc.) and will remove all after installed applications.
Video Overview
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Switch off the tablet.
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Press and hold the Home + Volume UP + Power buttons simultaneously.
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When you see the Galaxy logo, release only the Power button.
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In Android System Recovery menu use |Volume Up/Down keys for navigation and the Power button a choice. Select one after one:
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wipe data/factory reset
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Yes -- delete all user data
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reboot system now
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That's all.
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