The "mtk-su failed critical init step 3" error marks the end of an era. It is the digital tombstone for an elegant exploit that gave life to old MediaTek devices. While frustrating to encounter, it is ultimately a sign of progress—MediaTek finally closed a security loophole that had been open for years.
While there is no guaranteed fix for a hardware/firmware incompatibility, you can try these steps to rule out software-related issues:
This completely bypasses the need for the CVE-2020-0069 vulnerability by creating a clean, developer-sanctioned root state. mtk-su failed critical init step 3
[mtk-su Exploit Flow] Step 1: Check hardware architecture & kernel variables ---> (Failure = Incompatible CPU) Step 2: Map memory addresses & locate kernel symbols ---> (Failure = Security patch obfuscation) Step 3: Trigger exploit payload to overwrite UID/GID ---> [CRITICAL INIT STEP 3 BREAKS HERE] Step 4: Escalate privileges & modify SELinux policies ---> (Failure = Kernel panic / Permission Denied)
However, as Android security evolved and MediaTek patched vulnerabilities, many users began encountering a frustrating roadblock. After running the command, instead of a # prompt, they were met with a cryptic error message: The "mtk-su failed critical init step 3" error
Certain OEMs (e.g., Samsung, Xiaomi, Huawei) implement stricter SELinux policies that stop the patching process.
In March 2020, Google patched a critical vulnerability affecting many MediaTek-based devices that had been known by MediaTek since April 2019—10 months before being fixed. The vulnerability was assigned the identifier CVE-2020-0069. While there is no guaranteed fix for a
to an older version (if the bootloader allows it) to use this specific tool. Check mtk-su Version : Ensure you are using the latest version of from the official XDA Developers thread . Older versions may fail on newer security patches. Alternative Methods fails, you might need to use more advanced tools like
Users with devices that auto-upgraded around June 2021 found that mtk-su suddenly stopped working, displaying “Failed critical init step 1” (or step 3), even though the same device had been successfully rooted just months earlier.
: Newer security updates from manufacturers (like Amazon for Fire tablets or Oppo) may have patched the specific vulnerability the tool relies on, causing it to fail at critical initialization steps. Architecture Mismatch
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