For devices completely locked down in software, low-level hardware exploits like or MTK Bypass utility take advantage of vulnerabilities in the MediaTek Boot ROM (BROM). These tools force the processor into a service mode via a USB connection before Android even begins loading, completely bypassing user-space security updates.
mtk-su is an exploit tool targeting MediaTek devices that uses CVE-2020-0069 to elevate privileges from an unprivileged shell ( $ ) to a fully privileged root shell ( # ). The tool was originally developed by a developer known as "Diplomatic" on the XDA Developers forum. It works by leveraging a vulnerability within the MediaTek Command Queue (CMDQ) driver, which allows a local attacker to achieve arbitrary read/write of physical memory addresses, leading to privilege escalation.
Connect the device via USB while holding the volume buttons.
Use a flashing utility like (Smart Phone Flash Tool) to flash the older firmware onto your device. mtk-su failed critical init step 3
: Write the modified image back to your phone storage layer using the command fastboot flash boot magisk_patched.img .
If you attempt to run the 64-bit (arm64) version of mtk-su on a 32-bit kernel, the binary will fail to execute properly, often showing the "Failed critical init step 3" error in the process. With 32-bit devices becoming rare, this is still a possible reason. Choosing the wrong architecture for your device's kernel—such as using an arm64 binary on a device that only supports armv7l—will cause the exploit to fail at the initialization stage.
The script functions through a series of logical validation checkpoints known as "critical init steps." For devices completely locked down in software, low-level
The most definitive way to resolve a "step 3" error is to rollback the device's operating system to an earlier version released before March 2020.
Go to .
The mtk-su tool is a specialized command-line binary developed by developer diplomatic on the XDA Forums . It targets a severe security vulnerability (CVE-2020-0069) found within the kernel drivers of several MediaTek (MTK) ARMv8 chipsets. The vulnerability allows a regular user application to read and write directly to physical memory addresses. The tool was originally developed by a developer
Download the latest standalone mtk-su zip file from the official XDA Thread.
is the payload execution phase. During this step, the tool attempts to overwrite specific kernel memory structures (like cred structures) to elevate the current process permissions to root.
If you want, tell me your device model and Android build (example: "Xiaomi X, Android 11, kernel 4.9"), and I’ll suggest the most likely binary or Magisk/boot-patch approach.
MediaTek SoCs often have different "drivers" or kernel configurations depending on the manufacturer's firmware update.
Looking for device-specific workarounds. Conclusion