Hi all, I am new here and I need help. I tried to upgrade my Acer Iconia Tab A500 (AIT A500) from ICS to Jelly Bean but unsuccessfully. The message shown is my Android robot fall asleep (as attachments). I did the below steps for several times ... 1. Power off my AIT A500. 2. Press Power Up + Vol. Up together. 3. I am seeing the message "Booting Recovery Kernel Image" in black background. 4. Later, my Android robot fall asleep. Anybody please help me, thank you.