Asus BW-16D1X-U

[HSamwel]

Such a thing has never been reported before. Is this a drive in an USB enclosure? If yes you need to remove power AND USB. Otherwise the drive electronics is still powered by the USB connection.

These errors can also originate if the drive doesn't get enough power. Maybe with the new firmware it needs more power.

If it’s the same I have, it’s in an USB enclosure. It uses its own power and not from the USB.
You can find it on the ASUS site.

[Coopervid]

For a successful flash power needs to be removed completely. Both power supply plus USB. Otherwise the electronics is kept alive and doesn't reset the drive.