Android 15, the latest operating system from Google, has officially launched for eligible Google Pixel devices as of October 2024. This update introduces many new features, improvements, and optimizations, solidifying Android’s position as a cutting-edge mobile OS. While Pixel devices have already received the update, many non-Pixel Android devices may not be compatible with Android 15 or have to wait for manufacturer-specific updates.
Android’s open-source nature allows users to bypass these limitations using Generic System Images (GSI). Google releases GSI files with every major Android version, enabling users to install the latest Android OS on non-Pixel devices, including older models no longer officially supported. This guide will walk you through downloading and installing Android 15 GSI on any compatible Android phone, giving you access to the latest features without relying on your manufacturer’s update timeline.
What is Android GSI?
A Generic System Image (GSI) is a system image file, designed by Google that supports any Android device with Project Treble. It allows users to install the latest Android OS version (vanilla) even without getting interfered with by the device manufacturer. If your Android device runs on Android 8.0 Oreo or later, you can flash the GSI package to enjoy the latest available Android OS.
It means even if your specific device model isn’t eligible to receive the latest Android OS update officially, the GSI flash will open the doors for you. To flash the Android GSI file, your device bootloader should be unlocked.

I did these steps completely and downloaded ARM64 + GMS but the device is stuck in fastboot mode. Alcatel 3X 2019 5048y. How do I fix it? Thanks.