Are you executing the raw binary via or using a one-click app ? Share public link
MTK SU is a popular tool used to root Android devices based on Mediatek (MTK) chipsets. It allows users to gain superuser access, enabling them to modify system files, remove bloatware, and customize their devices to unprecedented levels. However, like any complex software, MTK SU can encounter issues, leading to frustrating errors like the failed critical init step 3.
Maps out the kernel memory space and locates the kernel symbol table.
Or if you have root via another method, make it permissive permanently.
The mtk-su package provides two distinct folders inside its directory structure: arm and arm64 . If your hardware architecture does not perfectly match the binary flavor, step 3 will fail. mtksu failed critical init step 3 best
What or security patch date is your device currently running?
Download the .
> ERROR: mtksu failed critical init step 3 best
: The most frequent cause is a security patch. MediaTek released fixes for this vulnerability in March 2020 . If your device has a security patch dated after March 2020, the exploit has likely been blocked by the manufacturer. Are you executing the raw binary via or
adb push mtk-su /data/local/tmp/ adb shell cd /data/local/tmp/ chmod 755 mtk-su ./mtk-su Use code with caution.
" 'Best'?" Sarah’s voice pitched up. "As in the 'Best Protocol'?"
MTK-SU only works on specific (e.g., MT6735, MT6750, MT6762, MT6765, MT8163, etc.) and kernel versions below 4.14 or with unpatched vulnerabilities. 👉 Check your device: getprop ro.board.platform uname -r
Install the correct MediaTek VCOM USB drivers on a Windows PC. However, like any complex software, MTK SU can
The "failed critical init step 3" message is an error message returned by the mtk-su program itself during its own startup sequence. It means the program's internal code has hit a problem, failing at a crucial stage (Step 3 of its 'critical init' process). The specific text Not a typewriter is a technical, legacy error code that often appears after setns failed:: Permission denied .
If your files are in the correct places but you still see the error, SELinux is likely blocking the exploit. Setting SELinux to permissive mode can clear the path for Step 3 to succeed.
Restart your Android device completely to release locked memory blocks.