I'm still new to Android customization, so thanks for your patients.
As per the thread title, I've bricked my old u20a. I attempted to unlock via flashtool, as in this video (youtube /watch?v=5YP77IrBG). I got as far as the 10 minute mark - bootloader unlocked via flashtool, nAa kernal and ROM on the SD card, and tried to boot into recovery. It hung at the part you are supposed to press the back key to enter to enter the recovery menu.
I decided to re-flash the kernel. Still hung.
I then figured I'd reset to stock. I saw another item in Flashtool called BLRelock. (see attached screenshot) I flashed it to the phone. My phone became a brick.
Bottom line, I now cannot talk to my phone via SUSE, Sony PC Connect, or Flashtool. Device manager does not detect it. Have I killed my poor phone?
Thanks in advance!