Your custom ROM must be based on or 5.1.1 . Using a GApps package designed for Android 5.0 or 6.0 on a 5.1 ROM will result in boot loops, force closes, or a completely broken system.
Includes the essentials plus popular standalone apps like Gmail, Google Calendar, and the Google Now Launcher.
This is critical for older devices. Lollipop-era phones often have small /system partitions. If your package is too large, you will encounter "Error 70" (Insufficient storage space). If you hit this wall, you must choose a smaller package (discussed below) or, if you are an advanced user, consider repartitioning the device’s internal storage (though this is risky and not recommended for general users). gapps android 51
Android 5.1 is no longer receiving security patches from Google. Using GApps on this version involves inherent security risks.
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: Your custom ROM must be based on or 5
Adds minimal extra functionality, such as "Okay Google" support and the Google Search app.
If the Google setup wizard fails to appear or crashes continuously on the first boot, the GApps package was likely flashed after the device had already booted into the custom ROM for the first time. This is critical for older devices
When developers create custom ROMs—versions of Android modified by the community to improve performance or extend the life of older devices—they cannot legally include Google's proprietary software. This means a "vanilla" installation of Android 5.1 lacks the Google Play Store Google Maps , and, perhaps most critically, Google Play Services
Not all GApps packages are the same; they're built with different use cases in mind. Open GApps for Android 5.1 is available in several variants, each with a specific set of apps and a distinct size. Understanding these differences helps you choose the right variant for your device.