Experia X10 locked out. How do I Master Reset?

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Experia X10 locked out. How do I Master Reset?

My brother's kids were playing on his Experia X10, and now, the phone is locked up.  My brother failed to create a gmail account when it was first purchased.  When I called AT&T customer service, I was told that my only option was a master reset.  I followed the instructions that were emailed to me. The phone would not reset.  Then, we went to the local retail store.  The sales rep could not reset the phone.  I set up a gmail account once we left the store for my brother, but the phone does not recognize it since it was not set up prior to the lock out.

Any suggestions on what to do next?

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