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I have many non-DRM mobi books that were not purchased through amazon. I transfer these books to my Kindle PW from my PC by drag and drop to the documents folder using the micro USB connection. The books show up on the Kindle home screen (usually with a blank default cover or a scrambled version of the actual book cover) but when I try to open them I get the following error:

Unable to Open Item - The selected item could not be opened. If you purchased this item from Amazon, delete the item and download it again from the Cloud on the Home Screen.

I have also tried using Calibre to transfer the books and I get the same problem. I tried converting them to AZW3 files with Calibre and I don't get the error but instead my Kindle freezes when I try to open the file, or it opens and freezes a few pages in. I even tried a mobi to mobi conversion, no good. These files work just fine using the Kindle PC app before and after converting them with Calibre, they are not corrupt.

The only thing that has worked so far is to email the mobi files to my kindle by using the *****@kindle.com email. The books show up on the home screen with the correct covers and open just fine. However, this can't be a permanent solution for me as I will soon be leaving for Job Corps and will have no wi-fi access and limited internet access in general so I can not rely on this method all of the time. A direct connection to my computer for file transfers is really what I need.

Also, I have tried rebooting and resetting my device, and calling customer service to no avail. A different cable makes no difference. Although I do currently have wifi and can add a bunch of books at this time through email, I am not entirely satisfied with this because something is clearly not working properly with my device.

Has anyone else experienced this problem, hopefully with some advice? Thanks in advance