Unhappy Unable to install any ROM

Hi Guys,

I've recently bought the Xperia T, loving the phone but would like to try out new ROMs. I can't unfortunately unlock my bootloader, so I'm trying to install ROMs that are compatible with locked bootloaders. I'm able to root, install CWM, and then boot into it, no problems here, I'm able to wipe the cache, etc, but when I choose the ROM zip file it says that is was flashed successfully, but it is way too fast, takes about 2 sec to flash any ROM and then, when I reboot the phones gets stuck at SONY logo, I used the flashtool to get it back up and running. This is happening with every ROM I'm trying to install, can anyone help understand why is this happening?

Thank you everyone...