: If the device was recently updated, the only definitive way to use mtk-su may be to flash an older, vulnerable firmware version. Note that this carries a high risk of "bricking" the device if not done correctly. Warning on Security
mtk-su can fail at different initialization steps, and these different errors may indicate different underlying issues:
Inspect logcat and dmesg
. If it is newer than March 2020, the exploit is patched, and cannot work on your current firmware. Retry Permissions
Before abandoning the process, use these diagnostic steps to confirm whether the device is permanently patched or experiencing a configuration error. 1. Isolate the Error via ADB mtk-su failed critical init step 3
The "mtk-su failed critical init step 3" error is a common obstacle for those attempting to root MediaTek devices using the CVE-2020-0069 exploit. Understanding the root cause—whether it's the security patch level, SELinux enforcement, architecture mismatch, or corrupted binaries—is essential to resolving it.
For devices using the Generic Kernel Image (GKI) standard (typically Android 12 and newer with kernel version 5.10 or higher), KernelSU offers a modern alternative that patches the kernel directly.
We can also walk through the exact steps to from your device's stock firmware, or troubleshoot any ADB communication errors you might be encountering. Share public link
Re-open the app, tap the option menu, and verify if a prompt asks to download or update internal assets. : If the device was recently updated, the
If correcting the path and updating the software fails to resolve the error, your device is likely running an Android security patch level released after . Google and MediaTek deployed patches addressing this specific security vulnerability (CVE-2020-0069).
If the device previously supported mtk-su on an older software version, you can flash a past firmware build to re-expose the vulnerability.
When mtk-su reports a failure at step 3, it generally means the exploit attempt was blocked or incompatible with your device's security patch. 1. Security Patches (Most Common)
Find an official stock ROM for your exact phone model dated . Download a MediaTek flashing tool, such as SP Flash Tool . Flash the older firmware to your device. If it is newer than March 2020, the
Even among identical device models, variations in build dates can affect whether MTK-SU works. One user reported that out of three identical Amazon Fire tablets, two rooted successfully while the third failed. The successful devices had a build date of May 27, 2019, while the failing device had an August 9, 2019 build—suggesting that firmware updates within the same model line can break compatibility.
Android enforces strict SELinux policies that prevent binaries from executing from standard user storage paths like /sdcard or /storage/emulated/0/ . If mtk-su is not executed directly out of a highly specific internal directory like /data/local/tmp , it cannot spin up its initialization steps. Direct Technical Comparison of mtk-su Errors Error Message Failure Meaning Common Root Cause Incompatible hardware platform Running on a non-MediaTek or unmapped processor arch. Failed critical init step 3 Exploitation block / Memory rejection System patch level is too new or kernel is protected. Failed critical init step 4 Bad address setns failed / Permission Denied SELinux containment or strict container restrictions. How to Diagnose and Troubleshoot
Fixing the "mtk-su Failed Critical Init Step 3" Error: A Complete Guide