I copied the latest update (4.1.4) to my desktop. I connected my 4th generation Kindle to Desktop via USB cable. I copied the update to my Kindle and placed in both the document directory and the top directory, and verified it completed. I disconnected Kindle from Desktop. I held the Power button for 40 seconds after which the Kindle showed the bar and it was doing something. However the version remained at 4.1.3. I did this a second time without success. I do not have a "update your Kindle" choice under settings. What am I doing wrong?