Other reasonsĪ company may also decide that their method of communication (protocols) need to be updated to newer specifications that aren't available in old versions of the SDK. Mobile stores like Google and Apple don't have an easy way for a user to get older versions, even though the developer can still see those old versions. The old version is still available somewhere when a new version is released. In fact, most non-mobile software development is done like this. Some companies may rewrite their software completely (for various reasons including getting rid of large amounts of unnecessary legacy code), then post it as a separate app, leaving the previous version available as their idea of backwards compatibility. And sometimes it's removed because of good reasons, usually meaning that it has significant security issues.Īnd just because the app is dropped, it doesn't mean that there isn't a newer version available. Some of these differences are even deprecated (disapproved of) or completely removed from the newer SDKs, which makes it difficult or impossible to maintain backwards compatibility. Speaking as a developer, it can be difficult to remember what settings or commands mean to different versions of an OS. The Android SDK (software development kit) sets a minimum version of Android that it supports, as explained by another Q and A:ĭevelopers/companies (referred to as just "developer" from now on) can choose to support older version, but it gets hard to maintain that code. And of course it removes the necessity to test the app on such old devices which can be a problem if you want to test your app on physical devices (not emulators) as old devices break and are more and more difficult to get. Decreasing the number of supported Android versions simplifies the app as old workarounds can be removed and don't have to be maintained anymore. Therefore if you want to make use of them and the functionality is not optional in your app, app developers may decide to drop support of older Android versions in favor if being able to use new features of new Android versions. The main problem is that newer Android versions include interesting new features that are not (fully) available using the compatibility system Google provides. Therefore the common way is option 1 – one app that has all compatibility fixes included. This way is often not used or only if the app has been completely rewritten for new devices and for old devices the old version remains with minimal to no support. The second option is of course very costly as you have to develop maintain each app app version independently (or at least large parts of the app). Turn your eReader off and charge it for at least one hour.There are two ways to support old Android versions:īuild one app that makes use of compatibility patches to supports old Android versions (down to a specific version) but also support all modern Android versions.īuild two or more apps each for a set of Android versions.Go to your Home screen and re-open the book.Some books have blank pages at the beginning or end of chapters and the beginning or end of the book.Follow the steps in this article to learn how: Reset your Kobo eReader. Note: If you reset your eReader, you'll lose your bookmarks, annotations, and notebooks. If you tried all the steps above and still can't get your eReader to work properly, try resetting your eReader. If your eReader isn't working as expected after trying the steps above: To do this, while reading, tap the centre of the screen to bring up the Reading Menu, tap Back to Home at the top left of the screen, then open your book again. If you have issues viewing your book, or if the book doesn't show pages correctly, try re-opening the book. If you can't find your book after repairing your eReader account, follow the steps in this article to find your missing book: Troubleshoot missing eBooks and audiobooks Follow the steps in this article to quickly find a book on your eReader: Search for a book on your Kobo eReader. If you have a lot of books, you can use the search feature to find it. Follow the steps here to repair your eReader account: Repair your Kobo account on your Kobo eReader. If you're missing a book that you recently purchased, or can't find a book you have in your Kobo account, try repairing your Kobo account. If your eReader's battery is completely drained it can take up to 15 minutes before it reacts to being plugged into power. If your eReader isn't charging, try using a different USB cable or a different USB port on your computer.
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