Hot — Mtksu Failed Critical Init Step 3
On many MTK boards, you can force BROM mode by shorting the CLK and CMD pins of the eMMC or the specific BROM_DISABLE test point. Look for schematics of your phone model (e.g., "Redmi 9T test points").
You’ve been trying to run high-end entertainment (3-hour Oscar movies, complicated board games, learning Italian). That’s like trying to play Cyberpunk 2077 on a smart fridge. Downgrade. Watch a 6-minute video of a raccoon opening a jar. Read a single chapter of a trashy novel. Put on one song and dance badly. Reboot after each success.
If you updated your device and then got the error, the bootloader might have patched the exploit. Use SP Flash Tool with the "Download Only" option to flash an older, vulnerable preloader (e.g., from Android 10 instead of Android 12). After flashing the older preloader, retry mtksu in "cold" mode.
Critical warning: Downgrading preloader can hard-brick your device if anti-rollback is active. Only do this if you have a full backup. mtksu failed critical init step 3 hot
Now run your original command, but add flags to enforce cold mode and disable handshake retries:
mtk-su -c --cold --step3-delay=500
(Note: Exact flags depend on the mtksu version; check -h).
If you are using the Python version (mtkclient), use: On many MTK boards, you can force BROM
mtk da seccfg unlock --hotmode-off
A user reported the exact error while trying to unlock the bootloader. The sequence below resolved it:
On Windows:
On Linux (Ubuntu/Debian):
When your device is powered on (hot), it draws more current. MediaTek BROM mode is extremely sensitive to USB signal integrity. A "hot" device may introduce electrical noise, causing the Step 3 security handshake to timeout or return malformed data.
If you have tried all the above and still see "mtksu failed critical init step 3 hot" on your device, it is likely that:
In this case, you need a hardware programmer like the Medusa Pro II or Easy JTAG. These tools bypass the BROM entirely by connecting to test points (CLK, CMD, D0 on eMMC). This is an expert-level solution, but it is the only way to recover a device that refuses to complete Step 3 even in cold mode. (Note: Exact flags depend on the mtksu version; check -h )