Effective in 2026, to align with our trunk stable development model and ensure platform stability for the ecosystem, we will publish source code to AOSP in Q2 and Q4. For building and contributing to AOSP, use android-latest-release. The android-latest-release manifest branch will always reference the most recent release pushed to AOSP. For more information, see Changes to AOSP.

Generic Bootloader (GBL) release builds

This page lists Generic Bootloader (GBL) release builds across release branches. To find a specific file, see the list of artifact file descriptions.

When a new GBL release is published on a release branch, the previous release on that branch is deprecated. We recommend that you always deploy the latest Google-certified release for your target Android version.

If you have questions about these builds, file a bug in the Android Generic Bootloader component or contact the team at android-gbl@google.com.

Artifact file descriptions

The following table describes the files contained in the GBL release artifacts (where $BID represents the release build ID):

Filename	Description
`signed-gbl-img-$BID.zip`	Google-certified signed GBL production image
`gbl_aarch64_prod.pdb`	Symbol table (PDB) for hardware debugger and GDB debugging against the certified production build
`gbl_aarch64_dev.efi`	Unsigned developer EFI app for board bringup and early debug
`gbl_aarch64_dev.pdb`	Debugging symbols for the developer build
`manifest_$BID.xml`	Pinned repository manifest file to recreate the GBL build exactly from source

Request a respin

Certified builds support partner-requested respins. To submit a request for a new GBL release, such as for a critical bug fix or CVE patch, see GBL respin process.

Android 17 releases

Parent branch: common-android17-6.18 (history)

Release date	Release, build ID, tag, and changelog	Status	Manifest	Certified binaries and symbols
August 27, 2026	Release 2 (Respin 1) Build ID: `16106998` Tag: `android17-gbl-20260818_r2` Changelog: `r1..r2`	Active	Manifest	Certified GBL image (Symbols) Developer build (Symbols)
June 9, 2026	Release 1 (Initial release) Build ID: `15564325` Tag: `android17-gbl-20260604_r1` Changelog: N/A	Deprecated	Manifest	Certified GBL image (Symbols) Developer build (Symbols)

Android 16 releases

Parent branch: common-android16-6.12 (history)

Release date	Release, build ID, tag, and changelog	Status	Manifest	Certified binaries and symbols
July 3, 2025	Release 1 (Initial release) Build ID: `13709664` Tag: `android16-gbl-20250703_r1` Changelog: N/A	Deprecated	Manifest	Certified GBL image Developer build

Build from source

To learn how to build GBL from source using the repo tool and Bazel, see Build GBL.