On the Android Developer site you can download Factory Images or Full OTA Images.

factory full ota image

What are the exact differences between them?


Factory images are bootloader compatible images, that is to say, they can be flashed using fastboot or alternative low-level tools or environment.

Full OTA images are over-the-air updates that are to be flashed via recovery environment. OTA updates are usually either incremental or full. Incremental updates require the user to be running a specific Android build (not just Android version) as they increment in the existing build only. On the other hand, full OTA updates don't require a specific existing build to continue. They are handy when a user hasn't updated their system for a long time and wants to skip successive incremental updates.

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