I had a similar thing happen on the .234 upgrade as well, but it was because I was impatient on the reconnect part. I thought it was failing, so I removed the USB cable. Bad idea. I had half the OS installed or something and it would not re-install, because it thought it already had .234. I had to go back to .167, and then forward to .234 again. The second time, I gave it more time to reconnect, which it did, and I was/am ok after that.
Lesson learned: be patient on the reconnect.