: This error often occurs when the device's security patch level is too high. The mtk-su exploit relies on a specific vulnerability in MediaTek chips (CVE-2020-0069), which has been patched on many newer devices or via security updates . If your kernel is "too new," the exploit will fail at an early initialization step because the vulnerability it targets is no longer present .
The error message (often appearing as failed critical init step 3 ) occurs when using the mtk-su exploit tool on MediaTek-based Android devices. It indicates that the exploit failed to initialize its early-stage memory corruption or process environment setup. Why This Happens
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The binary must have executable permissions. Running the tool from a directory that doesn't allow execution (like standard SD card storage) will cause initialization failures.
If using a terminal, re-issue the command chmod 755 mtk-su followed by ./mtk-su .
