10 Apr 2026 — 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
The update-signed.zip is central to Android's update ecosystem, particularly for Over-the-Air (OTA) updates. Official OTA packages are distributed as signed zip files.
fastboot flash boot boot.img fastboot flash system system.img ... etc.
The process, while technical, can be broken down into clear steps. update-signed.zip
: Verify your hardware device maintains at least a 60% battery charge level to prevent power interruptions during partition formatting. How to Flash update-signed.zip
Are you using a or a custom recovery like TWRP?
(Invoking related search terms.)
usually indicates a finished, "official" version of a developer's work, users should remain cautious: Source Trust : Only flash files from reputable sources (like XDA Developers or official manufacturer sites). Device Compatibility
: This is a useful alternative if you have connectivity issues with storage.
The signature also verifies that the file has not been corrupted during the download process. If even a single bit of data is altered, the cryptographic hash will not match, and the installation will fail. Usage in Custom Development 10 Apr 2026 — To generate a release
When a device receives update-signed.zip , the OTA client (e.g., update_engine or recovery mode) performs:
: Before placing the archive on your device or running an adb sideload command, check that the file's hash matches the source provider's documentation exactly. A dropped byte during a download can corrupt partition frames.
The feature includes a robust error-reporting mechanism for troubleshooting failed updates: How to Flash update-signed