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If you install a custom ROM (like CyanogenMod, LineageOS, or AOSP-based ROM) on a device running Android 5.1, the ROM will not include Google apps for licensing reasons. You must flash a GApps package separately to get the Play Store and other Google services.

: The bare minimum. Includes Google Play Store, Play Services, and core sync features.

: The primary portal for downloading and updating millions of apps.

: A clean install of "Pico" GApps on Android 5.1 typically requires roughly 100-150MB of free space in the system partition. SourceForge 3. Key Dependencies for 5.1