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To generate a release image, use: make dist sign_target_files_apks \ -o \ # explained in the next section --default_key_mappings ~ Android Open Source Project

Manufacturers use a private key to sign the build and include a corresponding public key in the device's recovery partition. update-signed.zip

Many modern Android versions allow you to install a ZIP directly from the menu: Sign builds for release - Android Open Source Project To generate a release image, use: make dist

For an update to be accepted by a stock recovery, it must pass a "whole-file signature verification". How to Use update-signed

When you attempt to flash the file, the recovery checks the last few bytes of the ZIP (the footer) for specific markers (like 0xff ) and then validates the cryptographic hash against its internal store. How to Use update-signed.zip There are two primary ways to apply these updates manually: 1. Via Local Update (System Settings)

Inside the ZIP, you will typically find a META-INF folder containing the update script and the signature, and various system images (like system.img or boot.img ) or file diffs.

Developers often use the SignApk.jar tool to sign their own custom packages.