oh damn, not a single word about your running OS
let me guess? win8, 8.1? if you have linux/ubuntu based available, i would suggest you to use flashtool,fastboot,adb on linux. if you only have win8/8.1. then you should search our xperia T forums, there are several posts about problems. there are problems with driver certification or other stuff like that since win8. if i remember right somehow i got all working on win8, but since i have win8.1, i switched to linux for android stuff^^
if i find the way i got it working on win8, then i edit my post.
best for the average pc user would be to use win7. my opinion.