: Ensure the file is in a directory that allows execution, such as /data/local/tmp , and that you have granted it the necessary 755 permissions via ADB .
: Ensure you are using the latest version of the mtk-su binary. Older versions frequently fail on devices with slightly updated firmware. mtk-su failed critical init step 3
"mtk-su failed critical init step 3" is a common failure message in the MediaTek-su (mtk-su) : Ensure the file is in a directory