The error message "MTKSU FAILED CRITICAL INIT STEP 3" typically occurs when using MTK Easy SU, a tool designed to provide "bootless" root access to MediaTek (MTK) based Android devices. This specific error usually indicates that the exploit failed to initialize properly, often because the device's security patch has blocked the underlying vulnerability (CVE-2020-0069) that the tool relies on. Potential Causes & Fixes
If you are encountering this error, it is likely because your device's software is too new for this specific exploit. Here is how to address it: How to use MTKSU to root Mediatek Android devices
It sounds like you’re encountering the “MTKSU failed critical init step 3” error, which typically appears when trying to gain temporary root access on MediaTek (MTK) Android devices using tools like MTK-SU or certain exploit-based scripts.
This error usually means the exploit failed during a specific initialization phase (step 3 of the critical init process). Below is a helpful troubleshooting guide to understand and potentially fix this issue.
If you are reading this, you have likely encountered the dreaded red text in your terminal or Magisk log: "MTKSU failed critical init step 3". You have probably spent hours searching forums like XDA Developers, Reddit, or Telegram groups, only to find fragmented advice.
This error is specific to MediaTek (MTK) devices attempting to gain root access via MTK-SU (a specialized root method for locked MTK bootloaders). Step 3 of the initialization process is where the exploit attempts to gain proper memory privileges. When it fails, your device either rejects the root request or soft-bricks the SU daemon.
Do not panic. Below, we break down the three best proven methods to bypass the "Failed Critical Init Step 3" error and successfully achieve root access. mtksu failed critical init step 3 best
Before applying fixes, you must understand what "Init Step 3" does. Without this context, you are fixing blind.
This failure is rampant on:
Given the specificity of “step 3 best,” an engineer would:
If "mtksu" refers to a specific tool or software, here are general steps you might take:
If you could provide more context about "mtksu", I could potentially offer a more targeted response.
The error message "mtk-su: failed critical init step 3" typically occurs when using the mtk-su tool to gain temporary root access on MediaTek-based devices (like Amazon Fire tablets) because the firmware security patch is too new. Why This Happens The error message "MTKSU FAILED CRITICAL INIT STEP
This specific "Step 3" failure usually indicates that the vulnerability exploited by mtk-su (CVE-2019-2215 or similar) has been patched by the manufacturer. Once the security patch level exceeds the tool's capability (generally post-2020/2021 patches), the exploit fails during its initialization phase. Best Solutions to Fix or Bypass
If you are seeing this error, your device's software is likely updated past the point where this specific "one-click" temporary root works. Here are your best options:
Downgrade Firmware (If Possible): On many Amazon Fire tablets (like the Fire 7 2019), if you haven't updated past a certain point, you can sometimes use specialized tools to "brick" the device into a state that allows flashing an older, vulnerable firmware.
Check Hardware/Bootloader Methods: If software-based exploits like mtk-su fail, you may need to look for hardware-level exploits (e.g., using a Linux environment and a micro-USB cable to trigger "bootrom" mode).
Verify Platform Compatibility: Ensure you are using the correct version of mtk-su for your processor architecture (arm64 vs. arm). Using the wrong binary can lead to initialization failures.
Use MTK Easy SU: If you are trying to do this via an app, try the MTK Easy SU GitHub releases. However, note that if the underlying mtk-su binary fails, the app will likely also fail on newer security patches. Fixing the "MTKSU Failed Critical Init Step 3"
Warning: Attempting to root or downgrade your device carries the risk of "bricking" it (making it unusable). Always follow guides specific to your exact model and OS version from reputable communities like XDA Developers.
To fix the "mtk-su: Failed critical init step 3" error while trying to gain temporary root on a MediaTek device, you usually need to re-apply file permissions or ensure the binary is placed in a writable directory. Quick Fixes for Step 3 Failure
Retry the Permission Command: Often, the initialization fails because the system hasn't properly registered the executable permission. Run the command chmod 755 mtk-su multiple times (three or more) from the /data/local/tmp directory.
Verify Directory Path: Ensure you have pushed the binary to /data/local/tmp. This is typically the only directory where a non-root user has write and execute permissions.
Check Architecture Compatibility: Ensure you are using the correct version (32-bit or 64-bit) for your chipset. A "64 bit ELF" error or "Incompatible platform" message usually accompanies these initialization failures if the wrong binary is used. Common Solutions and Context
Persistent Errors: If Step 3 continues to fail after re-applying permissions, it may mean your specific firmware has patched the vulnerability. Users on platforms like XDA Developers have noted that newer security patches often block these initialization steps.
App-Based Rooting: If you are using an app like MTK Easy SU, try clearing the app data, restarting your device, and ensuring you have an active internet connection to download necessary internal assets before clicking "Activate Root".
Check SELinux Status: Successful initialization should ideally end with a message indicating "Linux permissive" status, allowing the root supervisor to function.