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Brom Disabled By Efuse 0x146 Best May 2026

MediaTek has a built-in authentication mechanism called SLA (Secure Download Agent Authentication) and DAA (Download Agent Authentication). The eFuse 0x146 forces the BROM to demand a cryptographically signed DA.

The Fix: Tools like MTK Client (Python tool by bkerler) and UnlockTool have developed methods to bypass this authentication using a brom payload that ignores the eFuse check.

Best Steps for MTK Client (Free & Open Source):

Note: This works best on pre-2023 chips (MT6765, Helio G85). Newer Dimensity chips have patched this bypass.

For a few years, certain chipsets had a vulnerability in the BROM that allowed bypassing the 0x146 check (e.g., the infamous "BM EMMC" or "BROM blink" exploits). MediaTek has patched many of these, but old or budget chipsets remain vulnerable.

This is the technician’s last resort. The principle is to force the CPU into a lower-level BROM mode before the eFuse check is executed. brom disabled by efuse 0x146 best

How it works:

Best Tools for this: Easy JTAG, Medusa Pro, or Octopus Box with a proper pinout diagram.

Warning: This requires advanced micro-soldering skills. Incorrect shorting can permanently damage the CPU.

Summary: Your device has been permanently locked by the manufacturer at the factory. The message brom disabled by efuse confirms that the security mechanisms are active and working as intended. You will likely not be able to flash generic or third-party firmware onto this unit.

You're asking whether "brom disabled by efuse 0x146" is best — assuming you mean a device that shows that message during boot (e.g., an Android/Qualcomm/Broadcom device), it means the boot ROM (brom) entry is disabled by a one-time efuse setting (0x146). That is a hardware-level lock: you cannot use the boot ROM to dump or flash via the normal low-level recovery methods. Options and implications: MediaTek has a built-in authentication mechanism called SLA

  • Security note: This efuse setting improves device security by preventing low-level exploit-based flashing.

    • If you want specific next steps, tell me the device make/model and what you’re trying to achieve (recover data, install custom ROM, unbrick).

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    It sounds like you’re encountering a low-level boot failure on an embedded system (likely a Rockchip or similar ARM-based SoC), where the mask ROM (BROM) is being disabled due to an eFuse configuration. The code 0x146 typically points to a security or fuse-related policy that prevents further booting.

    Here’s a guide to understanding and troubleshooting this issue.

    Free tools often fail against 0x146. Commercial boxes are updated constantly to defeat new eFuse mechanisms. Note: This works best on pre-2023 chips (MT6765, Helio G85)

    Best Box for 0x146: Miracle Box (Thunder Edition)

    Infinity CM2MT2 also has a specific option: "BROM E-fuse 0x146 handler" in the settings. Check that box, then try the "Force BROM" mode.

    To understand the error, you must first understand BROM.

    BROM (Boot ROM) is a tiny, read-only memory chip embedded inside the main processor (SoC—System on Chip) of your MediaTek-powered device. It holds the very first code that runs when you power on your phone. Think of it as the BIOS of a computer, but more primitive and immutable.

    BROM’s job is simple:

    This "download mode" is what tools like SP Flash Tool, Miracle Box, and CM2MT2 exploit to flash firmware, repair IMEI, or remove FRP. For years, this backdoor was wide open.

    The manufacturer has blown the eFuse to enable Secure Boot.