That is the same situation that I had with windows 7 64 bit. When I had it hooked up to pc without debug mode on in device manager it showed up fine, but then when I was ready to run the tool I went into debug mode and device manager refreshed and the exclaimation point came up. This is because windows sees the device using the sony device driver but when debug mode is switched on windows is supposed to use the adb compsite driver and because of a PATH, and an Environmental variable miscommunication due to the location of the ADB driver location in the ADT bundle that you use for this,it loses communication. When you download the ADT bundle of the android development kit there is no "Windows Installer" or exe that places this composite bridge into the correct location like it does when you install the sony device driver. You just download the development kit and extract it to lets just say "Android" folder that you create on the root of C: Its there but you put it there, widows didnt by an install process so it has no idea where to look for that particular driver when you switch to debug mode. What I am telling you is what I have come to understand as the problem through trial and error. After hours of frustration and failure I finally just got on my XP machine, Installed the JDK with the windows installer, then I downloaded the ADT Android bundle. I created a new folder on C: called Android, and extracted the bundle into this Android folder, opened the package manager inside and installed the latest packages of USB driver, the Android tools and the Platform tools packages Then I plugged the tablet into the xp machine (not in debug mode) and when asked for the driver I pointed it to the actual Sony Xperia Z Tablet 311 312 drivers and made sure that it had communication that way. Finally I turned on debug mode on the tablet and xp showed that it found new device-Android composite interface, installed the drivers out of the Android development kit and when I looked in device manager in debug mode, it was there with no exclaimation point. I ran the tool, it took a total of about 5 minutes and the process was done. To all of the people who read this with true technical knowledge of this kind of stuff, I am sure this sounds crude and less than professional, but it is what I did and it worked the first try. I am far from a pro and that was my first experience with a sony device or a tablet. I strongly recommend you find an xp machine and do this because it worked for me.
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