Try manually transferring the files via USB.
Restart your Kindle Fire: press and hold the power button,
tap the Shut Down button when it appears on the screen.
After the device has completely turned off, press the
power button to restart.
Cannot delete book from Kindle
Fire.
1. From the Device tab in your Books content library, press
and hold the title of the book you want to delete.
2. Tap Remove from Device.
You can't delete books in the Cloud tab from your Kindle Fire.
To permanently delete Kindle books from your Kindle Library,
go to Manage Your Content and Devices
(http://www.amazon.com/mycd). Select the Your Content tab,
and locate the item you wish to remove.
Click the Actions button and choose "Delete" to permanently
remove the title item from your account..
Note that after the title is removed from your Kindle library on
your Amazon account, you will no longer have access to re-
download this title unless you re-purchase it. After deleting a
personal document from your Kindle Fire, your document is
permanently removed from your Kindle Library. Existing copies of
the deleted title or personal document already on your device will
not be removed unless you choose to delete them directly from
the device.
Book will not open/receiving an
error message when opening a
book.
If you're having problems opening a book from your Device
tab, try redownloading the book:
1. From the Device tab in your Books content library, press
and hold the title of the book you want to delete.
2. Tap Remove from Device.
3. Tap the Cloud tab, then tap the item to start
redownloading it again.
If you see an error message when downloading a book from the
Cloud tab, try tapping on the title again to restart the download.
If you're still having problems, try restarting your Kindle Fire:
press and hold the power button, tap the Shut Down button
when it appears on the screen. After the device has completely
turned off, press the power button to restart.
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