Android 5.1 is no longer receiving security patches from Google. Using GApps on this version involves inherent security risks.
If the installer says you do not have enough space on /system :
GApps is short for Google Apps. It is a flashable zip file containing core Google services and applications. Without GApps, an open-source Android operating system (AOSP) functions perfectly but lacks the framework required to connect to Google servers. Flashing GApps installs: gapps android 51
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: All core Google applications. It completely replaces stock browser, camera, and gallery apps with Google versions. Best For : Modern devices with large system partitions. Where to Download GApps for Android 5.1 Android 5
To install microG on Android 5.1, you generally need a ROM that supports . If your ROM does not support it, you can use a Magisk module (available for some Lollipop devices) to flash microG systemlessly. While less stable than full GApps, microG keeps the Android 5.1 experience alive without the weight of Google's framework.
Go to Settings > About Phone . You need or 5.1.1 . GApps for 5.0 (API 21) are different and incompatible. It is a flashable zip file containing core
Early Lollipop (5.0) was plagued by memory leaks; the 5.1 GApps packages are generally more stable, particularly in how they handle background synchronization.