Failed Critical Init Step 3 — Mtk-su

For older MediaTek devices, tools like Mobile Uncle or MTK Droid Tools can sometimes root devices even when mtk-su fails.

mtk-su works by manipulating kernel memory. If other applications are heavily using the processor or locking certain memory regions, the exploit may fail to write the necessary data.

If you are seeing the error , it means the mtk-su exploit tool—used to gain temporary root access on MediaTek-based Android devices—has failed to initialize its core memory manipulation routine. This specific error typically indicates that the exploit has been patched by your device manufacturer or that the tool cannot find the necessary memory offsets to proceed. What is mtk-su? mtk-su failed critical init step 3

MediaTek and Google patched the vulnerabilities used by mtk-su (such as CVE-2020-0069) in security patches released after March 2020. If your device took an Over-The-Air (OTA) update with a newer security patch level, the kernel memory protections block the exploit entirely, triggering the Step 3 failure. 2. Incorrect Architecture Binary

Open a terminal on your device (using Termux or ADB shell) and run: For older MediaTek devices, tools like Mobile Uncle

⚠️ Downgrading firmware carries risks, including potentially bricking your device if done incorrectly. Always ensure you have the correct firmware for your exact device model.

Here is a troubleshooting guide to resolve this issue. If you are seeing the error , it

In short, modern kernels add integrity checks that older exploits simply cannot bypass.

Failure at this stage means the exploit cannot proceed because the kernel or firmware patched the vulnerability, or the device’s security features blocked the operation.

Download the official MediaTek flashing utility, SP Flash Tool.