IIRC unless you have very very old version of Kindle for Android app you can't sync last page read between Android device and Kindle eInk device for USB sideloaded books (=books not associated with your Amazon account = books that are not bought from Amazon & not send to your "Cloud" space), because there will be no Sync button in Android app. (the app keeps a database with list of ASIN(s) and no match in database >>> no sync button for that book).
Kindle to Kindle sync works (worked last time I checked) for old mobi format but for azw3/kf8 books you get that error.
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