Key Points of This Article
- Android’s “Install unknown apps” feature has apparently been enhanced to not only block new app installations but also to block overwrite updates for apps installed from APK files.
- Our own investigation has confirmed that in the app code for the “Google Play services” v25.41 (version: 25.41.30 (260400-816076546)) update, the description “Blocks installation and updates of apps from unknown sources” has been added.
- This is expected to be an enhanced protection measure that blocks not only new installations of sideloaded apps but also overwrite updates for those already installed.
Android includes a device protection feature called “Install unknown apps,” which blocks app installations from APK files.
This “Install unknown apps” is a sideload-blocking feature that prevents new app installations from unknown sources. It now appears that this Android feature has been enhanced to not only block new app installations but also updates for apps installed from APK files.
According to our own investigation, we have confirmed the addition of the string “Blocks installation and updates of apps from unknown sources” within the app code of the Android system app “Google Play services” v25.41 (version: 25.41.30 (260400-816076546)) update, which was distributed around Friday, October 10, 2025.
This “Blocks installation and updates of apps from unknown sources” is expected to be an enhanced protection measure that targets and blocks not only new installations of sideloaded apps but also overwrite updates for those already installed.
<string name="aapm_sideloading_feature_summary">Blocks installation of apps from unknown sources</string>
<string name="aapm_sideloading_feature_summary_v2">Blocks installation and updates of apps from unknown sources</string>“Google Play services” App Link
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