This failure is overwhelmingly due to one primary reason: . Device manufacturers, especially for newer firmware versions or popular devices like Amazon's Fire tablets, have released updates that patch the vulnerability, making mtk-su ineffective.
If the troubleshooting steps above don't resolve the issue, try these advanced solutions:
Sometimes a simple reboot of both the computer and the phone/tablet clears the issue. Summary Checklist Check Binary Ensure you have the arm64 vs arm version right. Use /data/local/tmp Mandatory directory for executable permissions. Run chmod 755 Grants the file execution permissions. Verbose Mode ( -v ) Helps debug specific failure points. mtksu failed critical init step 3 best
If you are attempting to gain temporary root access on an Amazon Fire tablet, an older MTK smartphone, or any device powered by a MediaTek processor, you have likely encountered the mtk-su tool. The "amazing temp root" script developed by diplomatic on XDA Developers is a powerful tool, but it is not without its errors.
Consider mtk-easy-su (a wrapper for mtk-su that can sometimes handle the init steps better). This failure is overwhelmingly due to one primary reason:
binary has the correct execution permissions. In your terminal or ADB shell, run: chmod 755 mtk-su Then attempt to run the binary again. Check File Location : Verify that is located in a partition that allows execution, such as /data/local/tmp/
Sometimes, enforcing SELinux blocks the exploit. If you have any other way to set it to permissive, do so, but usually, this requires mtk-su already. When "Best" Isn't Enough: Other Considerations Summary Checklist Check Binary Ensure you have the
If you are a MediaTek-powered Android user attempting to root or unlock your device using the popular tool, encountering the error "failed critical init step 3" can be incredibly frustrating. This error typically signifies a permission denied or security check failure during the rooting process, preventing the tool from gaining necessary access to your device's system.