@newbie089 I did not brick it! When the battery was empty, I was able to get back into fastboot mode and use twrp again. I tried and failed to flash it with emma (could not be recognized even though in flash mode (green LED)) so i tried to flash the current devel_flashable (#2351078025 master 60732a96) and I am now back at the start (when I boot there is nothing happening but the SONY Logo showing all the time). Any help is appreciated. Cheers