Mtk-su Failed Critical Init Step — 3 High Quality
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 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. mtk-su failed critical init step 3
Common causes & fixes
| Cause | Explanation | Possible solution |
|-------|-------------|--------------------|
| Patched kernel | Security update fixed the exploit | Use a different rooting method (Magisk, unlocked bootloader). mtk-su works only on older Android versions (typically 9–10, early 11). |
| Incompatible SoC | Not all MediaTek chips support mtk-su (e.g., Helio G95, P90, Dimensity series may fail) | Check the developer’s supported list. Dimensity series rarely work. |
| SELinux enforcing | Step 3 may require permissive SELinux | If your kernel is vulnerable but SELinux blocks, you cannot change this without root. |
| Incorrect shell context | Running from a non-ADB shell or restricted user | Run from adb shell or a terminal emulator with proper privileges. |
| Mitigations enabled | Some vendors added extra checks | No fix — vendor hardened the kernel. |
1. The Patch: MediaTek’s Security Updates (The Most Common Cause)
Between late 2020 and mid-2021, MediaTek began systematically patching the vulnerabilities that mtk-su relied on. If your device has a security patch level (SPL) dated after November 2020, there is a very high probability that mtk-su will fail on step 3. Troubleshooting the “mtk-su failed critical init step 3”
Manufacturers like Xiaomi (Redmi Note series), Realme (Narzo/C series), and Samsung (Galaxy A series with MTK) quickly integrated these patches into their ROMs. If you recently updated your device’s firmware via OTA, you likely lost mtk-su compatibility.
Step-by-Step Troubleshooting Guide
If you are determined to get mtk-su working, follow these diagnostic steps. Platform: Must be mt68xx , mt67xx , mt81xx
3. SELinux Enforcement
mtk-su works best when SELinux is set to Permissive mode. If your device has Enforcing SELinux (the default on most stock ROMs), step 3 will often fail because the security policy blocks the final context switch to the root user.
🔧 Fixing “mtk-su failed critical init step 3” – A Practical Guide
If you’re seeing “mtk-su failed critical init step 3” while trying to root or gain temporary shell access on a MediaTek (MTK) device, you’re not alone. This is a common error, and it almost always points to a kernel or security patch mismatch.
Step 1: Verify Your Device’s Eligibility
Open ADB shell or a terminal emulator and run:
getprop ro.board.platform
uname -a
getprop ro.build.version.security_patch
- Platform: Must be
mt68xx,mt67xx,mt81xx,mt96xx, etc. Dimensity platforms are not supported. - Security Patch: Must be March 2020 or older. If newer, stop here—no amount of tweaking will fix step 3.