System Image Review: system-arm64-ab.img.xz for Android 12
The cryptic name of the image tells you exactly which device it is compatible with: system: Indicates this is the system partition image. system-arm64-ab.img.xz android 12
Extract the file: Use a tool like 7-Zip or WinRAR to extract the .img file from the .xz archive. System Image Review: system-arm64-ab
Note: Some devices require fastboot flash system_a system-arm64-ab.img (explicit slot). system-arm64-ab.img.xz android 12
Power off, then press Volume Down + Power (varies by OEM). Connect to PC.
Here is a breakdown of what each part of that filename means for your Android 12 installation: Breaking Down the Filename