Mtk-su Failed Critical Init Step 3 Info

The error "mtk-su failed critical init step 3" typically occurs when attempting to gain temporary root or execute privileged commands on MediaTek (MTK) Android devices using the mtk-su exploit tool.

1. Android Security Patch Level (The #1 Culprit)

This is by far the most common cause. mtk-su was designed to work on devices with security patches before March 2020. Google and MediaTek officially patched CVE-2020-0069 in the March 2020 Android Security Bulletin.

• If your patch date is April 2020 or later → The vulnerability is almost certainly fixed. Step 3 will fail 99% of the time.
• If your patch is from February 2020 or earlier → The exploit should work, but not always. Some OEMs backported security fixes.

Check your patch level: Settings → About Phone → Android Security Update

How to Diagnose the Error on Your Device

If you see "failed critical init step 3," follow this diagnostic flow before giving up: mtk-su failed critical init step 3

1. Check your Security Patch Level: Go to Settings > About Phone > Android Security Update.

   • If the date is 2020-11-05 or earlier: The tool should work. Failure suggests a different issue (see below).
   • If the date is 2020-12-01 or later: The exploit is almost certainly patched. Do not waste time.

2. Confirm your Binary Version: Ensure you downloaded the correct mtk-su version (e.g., arm64 vs arm). Use the uname -m command in ADB shell. If it returns aarch64, use the arm64 binary. If it returns armv7l, use the arm binary.

3. Check for Kernel Lockdown: Run cat /proc/sys/kernel/security/lockdown in an ADB shell. If it returns integrity or confidentiality, the kernel is in lockdown mode, which explicitly prevents runtime kernel exploits like mtk-su. The error "mtk-su failed critical init step 3"

4. Test on an Older Firmware: If you are determined to get root without unlocking the bootloader, you could try downgrading your device’s firmware to an older version (pre-November 2020) using SP Flash Tool or your manufacturer’s stock ROM flasher. Warning: This often requires an unlocked bootloader anyway, defeating the purpose.

🤔 What does “critical init step 3” mean?

mtk-su works by exploiting a vulnerability in older MediaTek kernels. Step 3 refers to the part where the tool tries to elevate privileges. When it fails at this stage, it means the kernel has likely been patched or the device’s security level is too high for that version of mtk-su.

Troubleshooting the “mtk-su failed critical init step 3” Error: A Comprehensive Guide

For years, mtk-su has been a lifeline for Android users with devices powered by MediaTek (MTK) chipsets. This powerful command-line tool, developed by XDA Recognized Contributor diplomatic, allows for temporary root access and the exploitation of CVE-2020-0069, a vulnerability in MediaTek’s kernel. However, as Android versions have evolved and security patches have rolled out, users are increasingly encountering a frustrating roadblock: failed critical init step 3. If your patch date is April 2020 or

If you see this error message in your terminal or command prompt, your exploit attempt has failed. But understanding why this happens is the first step to potentially fixing it—or accepting the limitations of your device.

In this guide, we will break down what “critical init step 3” actually means, why it fails, and what you can do about it.

2. Use Magisk (The Proper Root Method)

If your bootloader can be unlocked (e.g., Xiaomi, OnePlus, Realme), forget mtk-su entirely. Unlock the bootloader, patch the boot.img with Magisk, and flash it. This provides permanent, stable root without exploiting any vulnerabilities.