This is the most frequent cause. The vulnerability exploited by mtk-su was widely patched in early 2020. If your device's Android security patch level is dated , the vulnerability is likely fixed, and mtk-su will fail. Google had already released a fix in its Android update by March 2020, and many OEMs rolled out patches accordingly. Any firmware update released after March 2020 is bound to block the method used by the tool. The easiest way to check this is to navigate to Settings → About Phone → Android Security Patch Level on your device. If the date is 2020-03-01 or later, mtk-su will almost certainly fail.
However, many users encounter the frustrating error: mtk-su: failed critical init step 3 . mtk-su failed critical init step 3
The causes of this error can vary but might include: This is the most frequent cause