: In some rare cases, it is a one-off execution error. Step-by-Step Troubleshooting Guide 1. The "Try Again" Method
: Many Fire tablets updated after early 2020 are patched. If you are on FireOS 6.3.1.2 or higher (depending on the model), this software-based exploit may no longer work. mtk-su failed critical init step 3
"mtk-su failed critical init step 3" typically means the MediaTek temporary root exploit has been by your device manufacturer via a security update This specific failure usually occurs on devices like the Amazon Fire Tablet : In some rare cases, it is a one-off execution error