multiple times if it fails initially, as it sometimes requires repeated attempts to "take". Run Multiple Times : Community members on
: Sometimes the error is a temporary glitch. Try re-running the command to set permissions before executing the script: Use code with caution. Copied to clipboard Wait a few seconds and try running Downgrade Firmware
: The mtk-su binary must have proper execution permissions. If it's missing these, the initialization steps will fail immediately. Potential Fixes & Workarounds mtk-su failed critical init step 3
Even if your device runs an older security patch, manufacturers frequently modify the Linux kernel. Custom memory management or aggressive SELinux policies enforced by brands like Amazon, Xiaomi, or Oppo can block the specific memory injection technique used in Step 3. How to Fix or Bypass the Error
Ensure you’re in /data/local/tmp with executable permissions: multiple times if it fails initially, as it
One user noted: “Only the first few months of the [firmware] had an exploit, only the first and second could run it. the next 4-5 roms could be downgraded to use the mtk.”
(Note: On stock ROMs, this usually fails without root.) Copied to clipboard Wait a few seconds and
What is your ultimate goal (e.g., , installing a custom ROM , or unbricking )? Share public link
CVE-2020-0069 was a serious vulnerability that “allows a local attacker without privileges to read and write system memory, leading to privilege escalation”. The fact that it remained unpatched for nearly a year—MediaTek knew about it since April 2019, but the fix wasn’t widely distributed until March 2020—is concerning from a security perspective.
Execution from a restricted or non-executable memory partition. Namespace ( setns ) and privilege patching.
While mtk-su attempts to set SELinux to permissive during step 3, some stock kernels have been compiled with CONFIG_SECURITY_SELINUX_DEVELOP disabled or have SELinux hooks that cannot be bypassed via the exploited primitive. If the exploit cannot disable or bypass SELinux, step 3 fails.