fastboot devices Because this is an A/B device, you must know which slot is active. Usually, you can flash to both slots or just the current slot:
fastboot flash system system-arm64-ab.img Option B (safer for seamless updates): Flash to both slots system-arm64-ab.img.xz android 12
You should now have system-arm64-ab.img . Power off, then press Volume Down + Power (varies by OEM). Connect to PC. fastboot devices Because this is an A/B device,
In the ever-evolving world of Android customization, few files spark as much curiosity—and occasional confusion—as the system-arm64-ab.img.xz file associated with Android 12. If you have stumbled upon this filename while browsing repositories like LineageOS, phhusson's GSI releases, or Google's own SDK platforms, you are likely looking to breathe new life into a device, test stock Android on an unsupported phone, or understand the mechanics behind Project Treble. Connect to PC
For the average user, flashing a GSI is an adventurous but rewarding process. Expect bugs, embrace the learning curve, and always keep a backup of your stock firmware. For developers, the system-arm64-ab.img.xz file is a clean baseline for testing apps or building custom ROMs without compiling the entire device tree.