Critical Init Step 3: Mtk-su Failed

If you are determined to get mtk-su working, follow these diagnostic steps.

If your bootloader can be unlocked (e.g., Xiaomi, OnePlus, Realme), forget mtk-su entirely. Unlock the bootloader, patch the boot.img with Magisk, and flash it. This provides permanent, stable root without exploiting any vulnerabilities. mtk-su failed critical init step 3

Between late 2020 and mid-2021, MediaTek began systematically patching the vulnerabilities that mtk-su relied on. If your device has a security patch level (SPL) dated after November 2020, there is a very high probability that mtk-su will fail on step 3. If you are determined to get mtk-su working,

Manufacturers like Xiaomi (Redmi Note series), Realme (Narzo/C series), and Samsung (Galaxy A series with MTK) quickly integrated these patches into their ROMs. If you recently updated your device’s firmware via OTA, you likely lost mtk-su compatibility. Stop trying if : Your security patch is

Stop trying if: Your security patch is 2020 or later, Android version 11+, or kernel version 4.14 or higher.
These are almost certainly patched.

If your device has a 64-bit kernel but you are running a 32-bit shell environment (common when using some terminal emulators from the Play Store), the exploit may miscalculate memory offsets, leading to a step 3 failure. Always use a 64-bit terminal or ADB from a 64-bit platform tools build.