Brom Disabled By Efuse 0x146 May 2026

Some devices leave Preloader mode enabled even with BROM disabled. Try:

The 0x146 error surfaces under the following common scenarios:

Date: October 26, 2023 Subject: Analysis of Boot ROM (BROM) Disablement via eFuse Configuration 0x146 Status: Informational / Security Advisory

The short answer is no for standard tools and methods. The long answer is nuanced.

Summary

Background — BROM, eFuses, and secure boot

What “BROM disabled by eFuse 0x146” typically means

How to confirm the cause (diagnosis steps)

Remediation and options (ordered by safety and practicality)

Forensics and data preservation

Concrete examples and command snippets

Legal and ethical notes

Checklist for practical troubleshooting

When you should use WebSearch or vendor docs

If you want a tailored recovery plan

The error "BROM disabled by efuse 0x146" means that the device manufacturer has permanently blown a physical hardware fuse (eFuse) on your MediaTek device's chipset. This action forcibly blocks access to the low-level Boot ROM (BROM) mode. 

Manufacturers, specifically companies like Vivo and Oppo, deploy this hardware-level security to prevent unauthorized flashing, pattern lock removal, and device servicing through third-party tools like SP Flash Tool or CM2.  🛠️ Why This Error Occurs 

When you attempt to connect your phone in BROM mode (usually by holding the volume buttons while connecting the USB cable), the device's bootloader checks the hardware eFuses. 

The "0x146" Flag: This specific hex code signals to your computer's servicing software that the BROM pathway is permanently physically severed.

The Hard Barrier: Unlike standard software blocks, an eFuse is a physical microscopic fuse on the silicon chip. Once blown during manufacturing or via a security OTA update, it cannot be unblown.  🛑 What Not to Do 

Before looking at solutions, understand that certain common troubleshooting steps will absolutely not work for this specific hardware lock: 

❌ Do not keep spamming button combinations. You cannot force bypass a blown eFuse with volume keys.

❌ Do not attempt to downgrade your firmware via standard flashers. The BROM is locked, so standard flashing tools cannot communicate with the core chip to overwrite it.

❌ Do not trust sketchy "one-click fix" websites. Avoid paying for generic software claiming to "unblock eFuses." They are often scams.  💡 How to Work Around It 

Since BROM mode is physically inaccessible, you must rely on alternative data transfer and flashing methods permitted by the remaining live chip pathways.  1. Use Preloader Mode Instead of BROM 

Modern servicing tools have adapted to these eFuse locks. Instead of trying to force the device into BROM mode, utilize Preloader Mode. 

Ensure you are using the absolute latest version of your servicing tool (such as Hydra Tool, UnlockTool, or Pandora Box). brom disabled by efuse 0x146

In your tool's dashboard, change the connection setting from BROM to Preloader.

Select your exact device model and let the software exploit the preloader handshake rather than targeting the base boot ROM.  2. Hardware Test Point (ISP / EDL) 

If the software methods fail to communicate through the Preloader, you will need to bypass the security entirely at the hardware level. 

This involves carefully opening the device to expose the motherboard.

You will need to short a specific pin on the motherboard (called a Test Point) to the ground shield using metallic tweezers while plugging in the USB cable.

This forces the chipset into an emergency download state, circumventing the standard BROM boot check.

⚠️ Warning: This is an advanced technique. Only perform this if you have micro-soldering experience or take it to a professional technician.  3. Authorized Brand Accounts 

For many newer locked devices, companies require secure server authentication to flash firmware. 

Programs like UnlockTool sometimes offer server-based flashing for specific models.

Alternatively, taking the phone to an authorized brand service center is the safest route, as their official computers possess the digital cryptographic keys needed to authorize a flash without needing BROM access. 

Title: Bricked? Don't Panic! Understanding and Potentially Recovering from "BROM disabled by eFuse 0x146"

Introduction:

If you're reading this, chances are you've encountered a rather cryptic and intimidating error message: "BROM disabled by eFuse 0x146". This issue typically arises on certain Android devices, particularly those with Mediatek (MTK) chipsets, when attempting to flash or modify the device's firmware. Don't worry; this post aims to demystify the error, its implications, and possible steps to recover from it.

What does BROM and eFuse mean?

What does "BROM disabled by eFuse 0x146" mean?

When you see "BROM disabled by eFuse 0x146", it usually indicates that there's a specific configuration or protection set in the eFuse (in this case, the value 0x146) that has disabled the BROM functionality. This could prevent you from booting the device normally or performing certain operations like flashing the device via SP Flash Tool, a common tool used for Mediatek devices.

Causes:

The causes can vary but typically include:

Potential Solutions/Workarounds:

Prevention:

To avoid such issues in the future:

Conclusion:

Encountering "BROM disabled by eFuse 0x146" can be distressing, but understanding what it means and taking appropriate actions can help. Always prioritize data backups and exercise caution when making changes to your device's software. If you're unsure about any process, it's best to seek professional advice or support.

The error message "BROM disabled by efuse 0x146" is a critical security status encountered on MediaTek (MTK) devices, signifying that the low-level Boot ROM (BROM) mode has been intentionally and permanently locked by the processor's hardware. The Mechanism: eFUSE and BROM

In MediaTek chipsets, BROM is the first piece of code that executes upon power-on. It typically allows for emergency firmware flashing, system recovery, and factory repairs via a USB connection.

The term eFUSE refers to "electronic fuses" within the CPU—one-time programmable (OTP) bits that, once "blown" or set to a specific value, cannot be reversed. When a device shows the 0x146 value, it indicates that the manufacturer has triggered a security fuse to disable external access to this BROM interface. Why Manufacturers Use 0x146

This lock is primarily a defense against unauthorized modifications and exploits. Common reasons for this state include:

Anti-Rollback (ARB) Protection: To prevent users or malicious actors from downgrading to an older, vulnerable firmware version, the system may blow a fuse that restricts BROM access if it detects an attempt to bypass version checks.

Security Hardening: Modern devices (like those from Xiaomi or newer Samsung MTK models) often disable BROM to prevent the use of "bypass" tools that exploit vulnerabilities to remove screen locks or Google FRP (Factory Reset Protection).

KG/MDM Locks: On enterprise or financed devices, the 0x146 status can be a result of "KG Status" or other remote locking mechanisms intended to prevent the device from being reflashed or "unlocked" after a theft or contract breach. Implications and Recovery

When BROM is disabled by eFUSE 0x146, traditional flashing tools (like SP Flash Tool or common bypass scripts) will fail because the hardware refuses to initialize the communication handshake.

Hardware Permanent: Because eFUSEs are physical changes within the silicon, this state cannot be "fixed" via software.

Authorized Servicing: In many cases, the only way to flash such a device is through Authorized Mi Accounts or specialized manufacturer tools that use signed authentication (DA/Auth files) that the locked BROM still recognizes.

Test Point Methods: Some technicians attempt "test point" methods to force the device into a different state, though the 0x146 lock is designed to be resilient even against these physical interventions. Some devices leave Preloader mode enabled even with

Are you trying to recover a bricked device, or are you investigating this for security research?