Try these steps it might work as it did on my swipe halo 3g tab.
1. Turn off your device
2. Press volume up+down and power (all at same time and keep it pressed)
3. Leave the power button after 5 seconds.
4. Your device will enter into recovery mode.
5. Use volumes buttons to move up and down. For enter use power button(NOTE: TOUCH WON'T WORK)
6. Click on "wipe factory data" then click on "wipe cache partition".
7. Now go to reboot device and your sorted.
[DON'T FORGET TO PRESS THANKS IF THIS WORKS]