Quote:
Originally Posted by serjls
Hello! Koreader-android-arm-v2020.04.apk and koreader-android-arm-v2020.04.apk are not installed on Tolino Vision4HD (v13.2.1). About Errors does not produce, just "App not installed".
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https://github.com/koreader/koreader/issues/6066
TL;DR: uninstall and install the new package. Can't be fixed otherwise (unless you wait a few years and the number of commits will be > 17000

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