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.
Watch the device manager; it should register as a stable COM port (often labeled as MediaTek Preloader USB VCOM or MTK USB Port ) rather than dropping out immediately. Summary of Top Servicing Tools for eFuse 0x146 Bypasses Primary Bypass Mechanism Ease of Use Target Devices Preloader Crash / Custom EMI Parser High (Software Exploit) Vivo, Oppo, Xiaomi, Samsung EFT Pro Tool DA Protocol Enforcement / Test Point Broad MediaTek Portfolio Pandora Box Low-level Hardware Interface Emulation Professional (Hardware Box Required) Highly Secure MTK chipsets SP Flash Tool (Patched) LibUsb Filter + Manual Auth Bypass Complex (Open Source / Free) Universal MTK Conclusion
: Force the phone into Meta Mode instead of BROM mode, then flash an older version of the official firmware that does not include the BROM restriction. How to execute :
If software-based Preloader instructions fail to break through the security layer, you must look for a physical workaround on the device's motherboard.
To understand how to resolve this error, it is essential to look at the interaction between MediaTek's bootloader architecture and hardware-enforced security. brom disabled by efuse 0x146 best
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.
: Ensure you have uninstalled old MediaTek drivers. Install the latest MTK All-in-One Drivers alongside UsbDk Runtime Libraries to ensure your operating system can hand over control to the flashing software fast enough before the preloader times out.
Opening the phone for a Test Point will void your warranty .
Use your flashing software to select a or Meta Mode Read Info function. The error BROM disabled by Efuse [0x146] appears
The Test Point interrupts the standard execution flow, forcing the chip to accept authorization commands before the eFuse check locks out communication entirely.
Install the UsbDk driver framework to allow low-level USB filtering.
The causes of this error can vary, but common scenarios include:
Once downgraded, verify if the standard BROM communication port opens properly. 4. Authorized Server Flashing (Auth Bypass) Summary of Top Servicing Tools for eFuse 0x146
: Flashing firmware even when the phone wouldn't turn on. Bypassing FRP : Removing Factory Reset Protection.
A fine-tipped pair of tweezers, a device schematic or Test Point diagram specific to your phone model, and a compatible service tool. 2. Preloader Flashing Mode (SLA/DA Authentication Bypass)
[Software Exploit Attempt] │ ▼ [Check Hardware Security Register] │ ├──► If eFuse 0x146 is Blown (1) ──► Hard Blocks BROM Mode ──► "Error 0x146" │ └──► If eFuse is Intact (0) ──► Allows Direct BROM Access
However, as security demands increased, manufacturers began to lock down this critical access point. The latest and most formidable defense is the one you're encountering: