Complete Fix Solution

How to perform soft reset and hard reset ( master reset ) Samsung Galaxy Tab 8.9 i957 via Settings menu and External hardware keys:

Hard reset via Settings menu

1. select Apps from home screen or press Menu Key
2. select Settings
3. select Privacy
4. select Factory data reset 
5. select Reset device
6. select Erase everything. It will automatically reset and may not function for up to 15 minutes following the master reset.

To avoid permanent damage to your device, do not restart your device while a reset procedure is underway.

Warning! All data will be erased from device memory, including system and application data, settings and downloaded applications. Back up your important data. The device will restore to factory settings.

Hard reset via external hardware keys by entering android system recovery

1. Turn off the device
2. Press dan hold Volume Up button and Power Button simultaneously till the screen turns up and Samsung logo blinks for two times.
3. Then release the Power key but keep the Volume Up key pressed till you see Android system recovery screen.
4. select Wipe data / factory reset using Volume Down key to highlight.
5. Press home key.
6. select Reboot system now
7. Press home key.

Only do this if you can not do it via Setting menu.

Performing Soft Reset

If your phone or tab hangs or does not responding, try to Press and hold power key about 10 seconds. It will rebooting automatically. Or try to remove and re insert the battery and SIM Card ( If available ).