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After upgraded my X10 Mini Pro to Android 2.1, when I tried to connect my phone to PC Companion 2.0, after selecting USB connection on my phone, my phone automatically re-started! After restarted, my phone was locked (i.e. no response whatever I touched the screen or pushed the keyboard), there was an error message on my phone that there was no SIM card in my phone (in fact, I had not taken out the SIM card). The phone resumed to work only after I disconnect the USB cable from my phone.
I tried to switch off the phone (even took off the battery) several time and tried again, the same occured.
Before upgrading, everything worked fine.
What should I do? I can't downgrade it back to Android 1.6.
Repair your phone using Sony Ericsson Update Service Software. You can download the software from http://www.sonyericsson.com/updateservice