Unbrick An AT&T Sony Xperia Ion Yesterday I was looking for a CWM rom to flash and I found this: https://forum.xda-developers.com/showthread.php?t=2682782 . I had flashed this from my TWRP recovery that I got from here: https://forum.xda-developers.com/showthread.php?t=2634375 . While I was flashing the rom, the progress bar never moved but after about a minute or so it said that flashing the rom was successful. After I tapped Reboot System the screen just went black and wouldn't turn on. I wiped dalvik-cache, cache, and data prior to doing this. My bootloader is locked and flashtool does not work because of this. Any way I can unbrick my phone? My device is a LT28at.

Edit:
After leaving it on the charger, I got a red light and after a few seconds, it turns green for the same amount of time then goes back to red. And if it matters, I have disconnected the built-in battery and plugged it in and it gave me a red blinking led.
Calm down, your phone is not dead, you still can revive it simply by flashing a​ stock firmware using Flashtool. You should be carefully​ flashing Sony devices when having a locked bootloader.


Download the firmware here
Download the Flashtool here and install it. 
Go to the folder that contains the Flashtool (Usually C:/Flashtool) and launch it by clicking on either FlashTool.exe or FlashTool64.exe, whether on 32 bit machine or 64 bit)
Return to the folder and open the Drivers folder, install the drivers.(C:/Flashtool/drivers).
On Flashtool, click on the thunder icon, select Flash mode.
Now you should open the firmware select Window. The source folder address should be C:\User\your_name\.flashtool\firmware . Copy the firmware you've previously downloaded to that folder. It should now appear on the selector window.
Now click on flash button. Plug the USB cable while holding the volume down button or back button. Drivers should be installed and the flashing process started. 
Just wait until the end. 
Et voilà.