Xperia Z C6603 doesn't boot properly, need help topic

Hi folks, i have a Xperia Z C6603 with unlocked Bootloader. I installed the latest 4.4.4 Stock Rom (.292) via Flashtool. The only thing it shows after it boots up, is the black screen with the back button (take a look at the pic) and it reboots after a couple of seconds. I've also flashed a 4.1.2 Stock Rom (.253) it boots up normally, but there is no WiFi or cellular connection. It also shows me IMEI unknown :( I've also tried the Emma program, with the same black screen and instantly reboot :( Anyone knows what i can do ?

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[Q] XPERIA Z (C6603) power ON not reponding but red LED light still working topic

JUst add me up in facebook account heres my email [U]arnelcabal43@yahoo.com
I will try to fix your phone