[jhowell]

I looked a bit more at the lock screen book cover feature to see what else I could discover. From what I could tell ads must be disabled and the book cover feature must be enabled remotely for this to work.

It looks for an internal message indicating that a book was opened and stashes a copy of the cover image in a file accessible over USB named:

/system/bookcovers/default/{uuid}_{asin}_{cdetype}.jpg

(The cover thumbnail images downloaded from Amazon and stored in /system/thumbnails for use in library displays do not have high enough resolution to be used for this purpose.)

Since it gets the cover image from the ebook reader component I believe that it will have access to whatever cover image is shown when you select "GOTO Cover" while reading the book.

I did not see any restrictions that would limit it to only work for Amazon-sourced books.

This is preliminary information, subject to change.