Same thing happened here. I have the A5C6, figured I’d check if there was an update using this method. There was and it downloaded, restarted, seems like it was installing fine and now its hard bricked. I had 100% battery before so I’m pretty sure that wasn’t it.
Kinda sucks…I’ve tried holding power button alone, and with volume buttons for extended periods of time, and nothing. Leaving it plugged in now for a few hours, still nothing. Looks like its dead.