It could be that, when the power supply went, it took the actual drive with it. When I took my 840e out of the case and installed it in my computer, it worked perfectly fine [as it should have]. Changing firmwares won’t help.
You can try to open the drive and clean the lens with a Q-tip and some rubbing alcohol, which may or may not work.
Flashing the drive to anything other than a 4164/4166-based drive firmware wouldn’t work, BTW, which is why you couldn’t even eject it as an H20 drive.
Also, please avoid crossposting, k? It confuses people, and is against the rules. It’s best to stay within your own thread.