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You did not say which tablet you have. For Ideatab Android tablet, start with battery fully charged and tablet OFF. Press and hold Volume Up and Power at the same time until menu appears on screen. To navigate the menu, use Volume Down to move through the menu choices, Volume Up to select the current menu choice (like an Enter key) and Power button to return to previous menu. On the "Factory Menu", move down to "Clear eMMC" and select that option. You should see a message that data is being cleared. This may take several minutes to complete. Wait for it. When it completes, the tablet should be reset to the way it came from the factory so you will have to set up again user ids, wifi passwords, download apps, etc.
Make sure you backup your files by connecting it to a PC (if you have access to one) via USB cable,you will have to do a hard reset, otherwise there is no other way to get past the lockscreen (unless you have a recovery option with your email address)
Below is the process to tell you how you can hard reset your Samsung tablet (should work with any tablet):
Ensure that the Samsung tablet is powered off.
Press the Power and the Volume Up button together till the device displays the start-up logo.
Once the logo is displayed, release the buttons and wait till the device enters the Android system recovery mode.
On the displayed screen, use Volume Down button to go to the wipe data/factory reset option (Volume Up and Volume Down buttons are used to highlight the displayed options on the Android system recovery screen).
Once the option is highlighted, press the Power button to select the option. (Pressing the Powerbutton in Android system recovery mode selects the highlighted option.)
On the next screen, press the Volume Down button multiple times till the Yes -- delete all user data option is highlighted.
Press the Power button to hard reset the Samsung tablet device while clearing the dalvik cache along with the process.
Once your device is hard reset and rebooted successfully, you will see that the unlock pattern obstruction is also gone, and you can now set a new unlock pattern on your Samsung tablet.
Take a microSD card out of the slot. (Empty the microSD card slot.)
Press and hold down the power button for a few seconds while pressing and holding down the "Home" (Silver Push Button) button. (Both "Power" and "Home" buttons must be pressed down until he see the phrase "upgrade system activated" in the middle of the screen.
Release both buttons once the phrase "upgrade system activated" appears on the screen.
Wait until it reboots. You will see the following sentences on the left top corner of the screen: Can not find any update image. Press MENU/KEY_VOLUMEUP key to init SD card, Press BACK/KEY_VOLUMEDOWN key to cancel.
Press the "VOLUME UP" key. The volume up key is located at the left side of the unit and the button is closer to the built-in camera than the volume down button.
Wait until it finishes making a partition and shut down the system automatically.
Once the unit is turned off, your system will be reset to the factory settings. Thus, your previous data are lost at this point.
Are you trying to wipe the data with the reset? This will get you back to factory settings. It is entirely possible that there are apps on the tab that need to come off and have caused a problem.
1. With the device off, press and hold Volume Up and Power.
2. Release the Power button when you see the Samsung logo, but continue to hold Volume Up until the recovery screen appears.
3. Use the Volume buttons to navigate the menu and select wipe data / factory reset. Press Home to choose the selection.
4. Press Volume Up continue.
The Galaxy Tab should then go through the hard reset process.