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I have been unable to connect my Xperia P to the computer (OS: Win7 x64) for over a month. Every time I tried to connect via USB, the MTP driver installation process started and said "failed to install" after a while, therefore the PCC cannot even detect my phone. I am sure it is not the problem of my computer because I have tried different computers with Win7 x64 and PCC installed but all failed, while my wife's Xperia neo successfully connects to these computers in MTP mode.

But this annoying bug got solved accidentally today. All I have done is:

1. Turn on the USB debugging mode.

2. Turn off the phone.

3. Connect the phone to the computer via USB, and the computer says that USB Mass Storage connected (You know that the NXT phones doesn't have the MSC mode).

4. Turn on the phone, and it starts installing the MTP driver again. Although I am preparing to get another failing message as repeated many times in the past month, this time the driver is installed successfully!

I don't know if the step 1 is necessary because I turned off the USB debugging mode after step 4 and the connection still works. Since I have seen a lot of discussions about failed MTP connection in the past days, I think you may try my solution. Good luck!