: Some professional tools (like UnlockTool , Chimera , or Pandora ) may have specific protocols for newer security versions. If the BROM is disabled, these tools often attempt to utilize the Preloader mode instead of the BROM mode to communicate with the device.
This is the very first code that runs when a MediaTek chip powers on. It’s hardwired into the silicon. Technicians use it to unbrick phones or bypass screen locks because it runs before the operating system.
This error is most commonly associated with MediaTek processors, but the underlying technology is not exclusive to them. The 0x146 code is specifically tied to MediaTek's implementation of hardware security, and these errors are prevalent on a wide range of MediaTek-powered phones, including those from brands like Vivo, Samsung, TCL, BLU, and Motorola.
Select the "Disable Auth" option. When the tool waits for the connection, connect the phone using the modified button combinations recommended by your tool's active update log. Comparison of Methods for BROM 0x146 Bypass Feature / Method Preloader Servicing Tools Hardware Test Point Custom DA Flashing Very Low (Software-only) Medium (Requires opening case) Low to Medium Success Rate High (Depends on tool updates) 100% (Hardware override) Moderate (Requires correct files) Hardware Required Only a standard USB Cable Tweezers & Screwdrivers Only a standard USB Cable Best Used For Fast FRP/MDM/KG unlocking Unbricking dead devices Manual firmware upgrades Critical Steps for Troubleshooting brom disabled by efuse 0x146 best
: This update was released to counter the widespread use of Python-based BROM exploits. Devices with this efuse set will no longer enter BROM mode via standard "Volume Up + Down" button combinations. Software vs. Hardware
If you are looking for the best way to handle a "BROM disabled by eFuse 0x146" error, the approach must shift from generic USB flashing to specialized tools that can interact with the device in alternative modes. 1. Utilizing Advanced MTK Tools (Best Method)
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. : Some professional tools (like UnlockTool , Chimera
Try the connection again. If the error persists, it is definitely a hardware efuse issue. Summary Table: Which Path Should You Take? Best Solution Use UnlockTool (Paid) via "Crash Preloader" method. Phone is hard-bricked (No Power) Use the Physical Test Point method. Old SP Flash Tool fails Switch to MTK Client (Python) or SP Flash Tool V6 . Final Verdict
The error message appears in the log of a PC-based flashing or repair tool as follows:
If software-based Preloader instructions fail to break through the security layer, you must look for a physical workaround on the device's motherboard. It’s hardwired into the silicon
Download the original factory stock ROM along with the dedicated proprietary flashing tool (e.g., Mi Flash Tool for Xiaomi).
The error message "BROM disabled by efuse 0x146" low-level security lock found on newer MediaTek (MTK) chipsets
Attempting to bypass eFuse protections via hardware (Test Points) may void your warranty or permanently damage the device if not done correctly. Are you trying to a specific phone model, or are you looking for a tool recommendation to bypass this lock?