Here’s why sideloaded books might not be working on your Kindle
If you’ve recently tried to open a sideloaded book on your Kindle and hit a wall, you’re not alone. Starting this week, users across Reddit’s r/kindle community began reporting a sudden “Invalid ASIN” error message. The alert claims the selected title is not valid for Digital purchase on the Kindle, even when the book was loaded via USB or email rather than bought through Amazon’s storefront. Notably, the error only seems to affect unread sideloaded titles. Books that had been opened previously