Smartphone brands grew tired of these universal BROM exploits bypassing their security. To stop this permanently, they began implementing physical or logical "electronic fuses" (efuses).
This is the most promising avenue when BROM is locked. The Preloader mode is a different, less privileged boot stage. Some servicing tools can work within the constraints of this mode, especially if they support "advanced preloader authentication". While not all models are supported, tools like the Pandora Box have shown success in executing operations like FRP erasure for some devices using this method. This approach bypasses the need to interact with the disabled BROM.
If you are reading this, you have likely been staring at a flashing tool log (SP Flash Tool, Miracle Box, or CM2 MT2) that suddenly halted progress with the dreaded error:
While "unblowing" the fuse is impossible, here are the most effective ways to handle a device in this state:
Instead, the device forces a fast reboot or gets stuck in a preloader boot loop, returning the 0x146 error code inside your flashing software. The Best Methods to Bypass eFuse 0x146 Security brom disabled by efuse 0x146 best
: Always ensure you are using the latest version of your flashing software. Manufacturers frequently update security, and tool developers release "loaders" specifically designed to work around these disabled ports.
Are you comfortable to perform a hardware Test Point?
: As a last resort, replacing the phone's motherboard might be the only way to restore full functionality, though this can be expensive.
For professional technicians, staying updated with the latest information on which firmware versions blow the BROM fuses is critical. If you have a device that must be updated, perform all necessary low-level operations—like unlocking the bootloader or flashing custom firmware—before applying the update. Additionally, always back up the device data before any software update. Smartphone brands grew tired of these universal BROM
The is a hardware-level security lock. The best and most reliable solution is almost always the Test Point method . It physically overrides the security check, giving you full access to the chip for flashing, unlocking, or repair.
The error message "BROM disabled by efuse 0x146" low-level security lock found on newer MediaTek (MTK) chipsets
Which (e.g., UnlockTool, SP Flash Tool, CMT2) are you currently using?
Some large repair services or firmware websites provide: The Preloader mode is a different, less privileged
Connect the turned-off phone to the computer using a high-quality USB cable . 2. The Physical Test Point (Hardware Force)
The error BROM disabled by Efuse [0x146] appears in the logs of professional flashing tools like Pandora Box or Miracle Box when technicians try to connect to a device. It indicates that the manufacturer has permanently disabled access to the device's BROM (Boot ROM) mode.
The Boot ROM (BROM) is a read-only piece of code embedded inside MediaTek microprocessors. It executes at the earliest stage of the device's boot cycle. BROM mode allows a computer to talk directly with the chipset hardware via a USB connection, making it vital for unbricking dead phones, flashing low-level firmware, bypass operations, and forensic data recovery. The Role of eFuses