I have unlock 1.0.2 and use for few weeks. And update to 1.1.1 locked. Then I try to use iBrickr 0.91 to downgrade to 1.0.2, after downgrade it show an activate screen. And I try to use apptap. to activate it. But the phone keeping reboot when showing the apple logo. reboot and reboot, even I hold the power and home key, it cannot enter recovery mode. Anyone can help?