I bought a Chinese tablet (unknown type) working with android 2.2. it worked O.K(in china). now it uploads and stuck in the with the android logo (looking up). it has:1. power up key. 2. volume key 3. touch disable key & main button in the middle. what I am doing wrong ? how can I cause it to work ? if I connect a keyboard through the adapter nothing happens HELP me with any idea!!!!!!!!