reveny

Android-VBMeta-Fixer

v1.2.0guide

A Magisk/KernelSU/Apatch module to fix VBMeta detections on Android

★529 stars
•System Environment•by reveny•MIT•Updated May 10, 2025
Platforms:
✓ Magisk✓ KernelSU
Download v1.2.0Starting download...GitHub Source
vbmeta-fixer-v1.2.0.zip

Overview

Developed by reveny, Android-VBMeta-Fixer is a targeted systemless utility designed to resolve VBMeta detection vectors on rooted Android devices.

Advanced root detection libraries no longer stop at checking build tags or su binaries; they inspect Android’s low-level bootloader properties. Specifically, modern security SDKs check if ro.boot.vbmeta.digest is present, valid, and consistent with hardware attestation logs. Android-VBMeta-Fixer derives the genuine verified boot hash via key attestation and assigns it to system properties automatically.

Technical Architecture & How It Works

Hardware Key Attestation & Property Injection

The module executes during early system startup:

  1. Attestation Challenge: During early post-fs-data, the module queries Android’s Keystore subsystem to generate a transient attestation certificate.
  2. Digest Extraction: It parses the resulting ASN.1 certificate extensions to extract the verifiedBootHash generated by hardware.
  3. Property Setting: It injects the extracted hash into ro.boot.vbmeta.digest and related bootloader digest properties using root property manipulation tools (resetprop), presenting a consistent, verified boot profile to scanning applications.

Installation & Setup

  1. Download the latest Android-VBMeta-Fixer-*.zip release from the project’s repository.
  2. Flash the module using Magisk, KernelSU, or APatch.
  3. Reboot your device.
  4. Verify the property using a terminal emulator: 
    getprop ro.boot.vbmeta.digest

Configuration & Usage

The module requires zero manual configuration. It automatically detects the hardware architecture and applies the appropriate properties at each system boot.

Troubleshooting & Common Issues

  • Empty Property on First Boot: If getprop ro.boot.vbmeta.digest returns blank, ensure that your device’s Keystore HAL is responsive and that no other module is blocking post-fs-data execution.

Frequently Asked Questions

Why do some banking apps check ro.boot.vbmeta.digest?

On devices with locked bootloaders and Verified Boot active, the Android bootloader passes the cryptographic digest of the vbmeta partition in ro.boot.vbmeta.digest. When users unlock their bootloaders or flash custom ROMs, this property is often left empty or corrupted, exposing root.

How does Android-VBMeta-Fixer find the correct digest?

The module executes an on-device key attestation query during early boot, extracting the verified boot hash directly from the hardware keystore certificate and applying it as the system property value.