My device does something similar. When a new update comes out, 95% of the time the update will fail. When that happens, it continues to fail no matter how often I retry.

Through much trial and error, I found a way to make the update work every time. This may look stupid, but I swear it works:

  1. Try the update. It fails.
  2. Turn off the console.
  3. Take the hard drive out.
  4. Turn on the console. It will fail to boot and shutdown.
  5. Put the hard drive back in.
  6. Turn on the console. The update will start again and succeed.

I have no idea why this works, it makes no sense to me. But it's been working this way without fail for a few years.