10000080 - Mobile phone not responding.

This is very specific to Sony Ericsson PDA phones (mine is P1i).

If you encounter any of the following behavior while taking a backup -

• 10000080 - Mobile phone not responding.
• settings cancelled by the device
• Cancelled by device.
• Failed.. etc.

Delete all old backup files and then take a new backup. If you don't want to loose old backups then you should first export them and then delete. Exported backups can be imported back any time.

I kept on struggling for days and then finally decided to Master Reset my phone. Fortunately I came across some threads on the internet where people have faced same problems and while I had tried everything else, only this was the remaining thing. And it works!