The error "mtk-su failed critical init step 3" is a common failure message encountered when attempting to use the mtk-su exploit tool to gain temporary root access on Android devices with MediaTek (MTK) chipsets. What the Error Means
This error typically indicates that the exploit was unable to properly initialize its core functions on your specific device or firmware. "Step 3" specifically refers to a failure during the initialisation phase, where the tool tries to set up the environment required to bypass security measures. Common Causes
Patched Firmware: The most frequent cause is a security patch. MediaTek released fixes for this vulnerability in March 2020. If your device has a security patch dated after March 2020, the exploit has likely been blocked by the manufacturer.
Incorrect File Permissions: The mtk-su binary must have executable permissions to run. If permissions aren't set correctly (e.g., via chmod 755), it may fail during execution. mtksu failed critical init step 3 best
Incompatible Architecture: Using a 32-bit version of the tool on a 64-bit device (or vice versa) can trigger "critical error" messages.
Directory Issues: Running the tool from a directory that does not allow execution (like certain SD card paths) can cause it to fail. Best Troubleshooting Steps
Retry Multiple Times: Users on community forums like GitLab and Reddit report that the exploit is sometimes unstable and may work after 2-3 consecutive attempts. The error "mtk-su failed critical init step 3"
Verify Permissions: If using a command line (ADB), ensure you have moved the file to /data/local/tmp/ and issued the command chmod 755 mtk-su before running it.
Use the Latest Version: Ensure you are using the most recent release (often referred to as r15 or later) from reputable sources like XDA Developers or the Mtk Easy Su GitHub.
Check Security Patch Date: Go to Settings > About Phone > Android Security Patch Level. If it is newer than March 2020, this exploit will likely never work on your current firmware. Failure Identification : Describe the nature of the
If these steps do not resolve the issue, your device's firmware is likely too new for this specific bootless root method.
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.
Some exploits require running before certain services lock down interfaces.
Reboot → wait 10 seconds → run MTK-SU immediately.