My Xperia V is not being detected in Windows 8.1. It's only detected when using MTP or MSC, not Flash mode of fastboot mode. Before you start throwing "You must disable Driver signature enforcement" at me, flash and fastboot works for my Xperia Z1. I'm trying to relock my Xperia V's bootloader so I could give it to my uncle. Look at the attachment to see what message I got from Windows when connecting.
At first I thought having CM11, 4.4 kitkat was the problem. So I flashed a stock-based rom and kernel. Still no success.
That's interesting, as I've read a few times in different threads that Windows 8.1 simply won't allow the fastboot/flashmode drivers to be installed correctly (even with disabling Driver Signature Enforcement). I assume you have tried using different USB ports on your machine (and possibly even a different cable?)
It does not work on windows 8.1, due to Microsoft changing the USB stack to their own prohibitory driver. Microsoft have announced that there will be a fix in Feb, lets hope they keep to their word.
I have broken my windows 8.1 install many times trying to hack the USB stack, with Windows 8 specific drivers, but it's a no go. I guess we will all have to wait until the is an official fix from Microsoft in this respect.
Have A Bug with one Of my Roms? Look below on how to report them to me....
If you have a bug, report it with a logcat because, without one I can't do anything about it. No Logcat, Means No Fix. Do this below to get one...
adb shell dmesg ; adb logcat -b system -b radio -b events -b main
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20 Aug 2014
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