Project Treble: How Android Fixed Its Update Problem

Nadia Malik News

Introduction

In 2017, the average Android phone received exactly one major OS update — if the manufacturer felt generous. The reason wasn’t laziness. It was architecture. Every Android update required chipset vendors (Qualcomm, MediaTek, Samsung) to recompile their driver code against the new framework. Vendors had no financial incentive to update old chipsets. Manufacturers couldn’t update devices even if they wanted to.

Project Treble was Google’s solution: a modularization of Android’s hardware abstraction layer that separated vendor code from the framework. Treble was announced with Android 8.0 Oreo in 2017 and was the most important under-the-hood change in Android’s history.

It didn’t fix everything. But it made faster updates possible for the first time.

The Problem: Vendor Lock-In

Before Treble, Android’s architecture looked like this:

Android Framework → Hardware Abstraction Layer (HAL) → Linux Kernel → Hardware

The HAL was tightly coupled to both the framework and the kernel. When Google updated the framework, the HAL interfaces changed, and vendors had to update their driver code. This was expensive for vendors and impossible for old chipsets.

The result: Qualcomm supported a chipset for 2–3 years. After that, no driver updates. No driver updates meant no Android updates. The device was frozen on whatever version it shipped with.

The Solution: The Vendor Interface

Treble inserted a stable Vendor Interface (VNDK) between the framework and the vendor implementation:

Android Framework → Vendor Interface (VNDK) → Vendor Implementation → Linux Kernel → Hardware

The VNDK was a stable API contract. Framework updates wouldn’t break vendor code. A device with Treble could theoretically boot a Generic System Image (GSI) — a pure AOSP Android build — regardless of manufacturer.

This was mandatory for devices shipping with Oreo. Google required all new devices to pass the Vendor Test Suite (VTS), which verified Treble compliance.

What Treble Enabled

  • Faster updates: Manufacturers could update the Android framework without waiting for chipset vendor support.
  • Generic System Images (GSIs): Developers and enthusiasts could flash a stock AOSP build on any Treble-compatible device. ROM development flourished.
  • Longer update commitments: Samsung, OnePlus, and Nokia extended update guarantees from 2 years to 3–5 years, partly enabled by Treble.
  • Android Beta Program: Google’s public beta program expanded to non-Pixel devices (Nokia, OnePlus, Xiaomi) because Treble made it easy to port beta builds.

The Limitations

Treble didn’t solve everything. Manufacturers still had to choose to update. Carriers still had to approve OTAs. Low-end devices with obscure chipsets still didn’t get updates.

Treble also didn’t address the kernel update problem. The Linux kernel was still coupled to the chipset vendor, and kernel updates remained rare. Project Mainline (Android 10) addressed this for specific system components, but the kernel itself is still a bottleneck.

The Impact

Treble changed the update landscape:

  • 2017 (before Treble): Most Android phones received 0–1 major updates.
  • 2019 (after Treble): Samsung and OnePlus committed to 3 years.
  • 2022: Samsung committed to 4 years of OS updates + 5 years of security patches.
  • 2023: Google committed to 7 years for Pixel 8.

Treble didn’t single-handedly cause these improvements — market pressure and competition with Apple played a role — but it removed the technical barrier that made updates impossible. After Treble, manufacturers who didn’t update their devices had no technical excuse.

References

  • Project Treble technical documentation (source.android.com)
  • “Android 8.0 Oreo: Project Treble” (Android Developers Blog, 2017)
  • Generic System Image (GSI) program documentation
  • VTS (Vendor Test Suite) requirements
  • Samsung, OnePlus, Google update commitment statements

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