Method and evidence
What the worksheet can and cannot conclude
It maps user-entered state to a source-labelled first check. It does not inspect a file, account, device, firmware, DRM, metadata, cache, or transfer log.
| Source | What it supports | What it does not prove |
|---|---|---|
| Amazon ads help | Sponsored screens are a distinct lock-screen state. | Why a particular library thumbnail is missing. |
| Amazon library help | Connection, sync, delivery, purchase and filter checks when content is absent. | The cause of missing artwork on a present title, or a damaged file. |
| Amazon Colorsoft features | A model-specific option to display the currently read book on a Colorsoft lock screen. | Eligibility or identical settings for every Kindle family, app or firmware. |
| calibre FAQ | Separate older disappearing-library-thumbnail and ColorSoft/newer book-list behavior. The older reconnect case requires its documented symptom and version prerequisites. | A lock-screen repair, a universal workaround or a reason to alter the only copy. |
Primary-source boundaries checked 26 September 2026. This is a source review, not evidence of a successful repair on your device. Official source versions and behavior may change.
All unknown inputs remain unknown. The worksheet never recommends deleting the only copy, factory-resetting, stripping DRM, evading ads, or granting account access.