The specific kernel vulnerability (CVE-2020-0069) has been patched by the manufacturer.
When you run mtk-su , it executes in sequential phases. If a phase fails, it halts the program and throws an explicit error message (e.g., Step 1, Step 3, Step 4). 1. Security Patches and Fixed Exploits
: Amazon and other manufacturers released security updates that patched the kernel vulnerability (CVE-2020-0041 or similar) used by mtk-su . If your tablet is on a newer version of FireOS, the exploit will fail at an early step. mtk-su failed critical init step 3
The mtk-su failed critical init step 3 error indicates that your current Android kernel is successfully defending itself against the memory injection exploit. To resolve it, always double-check your binary architecture first. If that fails, look into downgrading your device firmware to a pre-March 2020 state, or transition to hardware-level tools like MTK Client to bypass software restrictions entirely.
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 The mtk-su failed critical init step 3 error
Understanding the root cause of this error—and learning how to troubleshoot it—can help you safely attempt alternative root options. What is mtk-su?
To help point you toward the right alternative tool or firmware, tell me: What is the exact of your device? mtk-su failed critical init step 3
: A simple system restart can clear hung processes in the /data/local/tmp directory that might be blocking the exploit from hooking into the kernel. Common Fixes from the Community
Find an older, official stock ROM (firmware package) for your exact device model dating before .
Find an official stock ROM for your exact phone model dated . Download a MediaTek flashing tool, such as SP Flash Tool . Flash the older firmware to your device.
"mtk-su: failed critical init step 3" is a known issue encountered when using the