Boot Samsung Galaxy Tab 10.1 in recovery mode

power - vol down - vol up

Reboot your tablet into recovery mode, as follows:

1. Hold 'vol down' and 'power' buttons on tablet
2. Release 'power' when samsung image is shown
3. Release 'vol down' when the two icons are shown
4. Use the 'vol down' to navigate between the icons
5. Highlight the left icon (box)
6. Press the 'vol up' to select it and boot into recovery mode