It is great news that we can do this now. I often read books with footnotes and if I check a footnote the “furthest page read” now becomes the footnote page at the end of the book. This makes keeping my iPhone/iPad/Fire in sync difficult.
From My Kindle Stuff:
Amazon has finally updated functionality to let us reset the furthest page read on our Kindle books. For a person like me who re-reads books all the time, this is long overdue, but greatly appreciated.
To access it, go to the Manage your Kindle page and click the button next to any of your Kindle books to see the new option.
Once you select the Reset option, you’ll get another window
The Learn More link takes you to this Kindle Help page advising the below.

