Connect the device to a USB power meter or a hub with LEDs. In "cold" state, the device should draw less than 5mA and enumerate as USB\VID_0E8D&PID_0003 (MediaTek Preloader) only for a split second.
Add a delay. Sometimes Step 3 fails because the tool is too fast. mtkclient --wait 3 --brom --da custom_DA.bin flash preloader mtksu failed critical init step 3 hot
If you have followed these steps and still receive the "failed critical init step 3 hot" error, your device's firmware likely contains the . In this case, mtk-su will not work, and you may need to look into traditional rooting methods like unlocking the bootloader and flashing a patched boot image via Magisk Manager . Connect the device to a USB power meter or a hub with LEDs
If you’d like, I can convert this into a troubleshooting checklist, a short incident postmortem, or a concise root-cause summary for an engineering ticket. Which would you prefer? Sometimes Step 3 fails because the tool is too fast
The "mtksu failed critical init step 3 hot" error can occur due to: