I don't have a new enough Kindle to run 5.18.5 and test this, but I saw on Reddit that turning off "About This Book" (which shows "information about the book when you open it for the first time") may solve the Invalid ASIN problem.
P.S. Has anyone running 5.18.5 successfully removed DRM from a book published after September 14, 2025?
Last edited by odamizu; 09-23-2025 at 03:47 AM.
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