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This is the most common approach for savvy users. The goal here is not to merge the files, but to install them manually. This requires a file manager and a basic understanding of the Android directory structure.
Android requires all apps to be digitally signed. If a converter modifies an APK (e.g., merging OBB files), the original signature is invalidated. The tool must re-sign the app with a test key.
4.2 Using XAPK-aware installers (automated)
In this article, we will break down what XAPK files are, why you need to convert them, the safest methods to do so, and a step-by-step guide to extracting the working APK from inside the XAPK container.