When this step fails, the error output typically appears in the terminal or ADB shell as:
To help point you toward the right alternative tool or firmware, tell me: What is the exact of your device?
Users often encounter this while attempting to root Amazon Fire tablets or budget MediaTek phones, frequently finding that the method no longer works on their specific build. Troubleshooting Attempts
Use specialized tools like MTK Client or SP Flash Tool for deeper access. 🛑 Important Warning mtk-su failed critical init step 3
Disclaimer: Rooting your device can lead to data loss and may void your warranty. Proceed with caution.
There is no workaround if the kernel vulnerability no longer exists. Proceed with unlocking the bootloader if you need root access.
Help: mtk-su failing at “critical init step 3” – any fixes? When this step fails, the error output typically
mtk-su works best when SELinux is set to mode. If your device has Enforcing SELinux (the default on most stock ROMs), step 3 will often fail because the security policy blocks the final context switch to the root user.
In simpler terms: You picked the lock, turned the key, but the door jammed. Step 3 is the most delicate part of the exploit because it requires the kernel to be in a very specific state.
Once downgraded, disable Wi-Fi during setup to prevent the device from immediately downloading the latest OTA update, then run mtk-su again. Method 3: Use Alternative MTK Exploits 🛑 Important Warning Disclaimer: Rooting your device can
Use correct mtk-su version
The hardware script will exploit the device's bootloader sequence directly over the USB connection, letting you read/write device partitions or unlock the bootloader without relying on mtk-su . Alternative Rooting Methods for MediaTek Devices
: The most common reason for this specific failure is that your device has received a security patch (often from March 2020 or later) that fixes the MediaTek-su vulnerability (CVE-2020-0069) the tool relies on.
This specific error indicates a failure during the initial exploit setup phase. While the tool developer, "diplomatic," hasn't released a public "error code manual," community consensus and logs show this usually means:
Or variations that include invalid option errors before the critical failure message.