Brom Disabled By Efuse 0x146 Best Online
Play video with total control.
Download Now
Compatible with Windows 11, 10, 8, 8.1 and 7
"BROM disabled by efuse 0x146" is a hardware-level security measure found on newer MediaTek (MTK) devices, including brands like Vivo, Oppo, and Samsung
. It indicates that the manufacturer has permanently "blown" an electronic fuse (efuse) to disable the Boot ROM (BROM) mode, which was previously used for unauthorized flashing and bootloader unlocking.
Since this is a hardware-level block, standard software bypasses often fail. Below is a guide to understanding and addressing this issue. Understanding the Error What is BROM?
A low-level boot mode in MediaTek chips that allows communication with a PC for flashing firmware before the operating system or bootloader even starts. The 0x146 Flag:
This specific hex code means the BROM entry has been permanently "closed" by the hardware efuse. Common Causes:
Modern security patches (2022 and later) for devices like the Samsung A-series
often ship with this feature enabled to prevent the use of tools like SP Flash Tool or MTK Client for bypassing security. Best Solutions & Workarounds
Because the direct BROM entry is locked, you must use alternative methods to "force" the device into a flashable state: Test Point (Hardware Shorting)
For many devices with this security, you must disassemble the phone and find the Test Point (typically a small gold pad on the motherboard). Shorting the CLK (Clock)
point to ground while plugging in the USB cable can sometimes bypass the software-level BROM disablement.
Caution: This requires opening the device and carries a high risk of permanent damage. Using Preloader Mode Newer tools like UnlockTool ChimeraTool MTK Client GUI attempt to communicate via the instead of the BROM. Ensure you have the specific DA (Download Agent)
files for your exact model, as generic files will trigger a "S_BROM_DOWNLOAD_DA_FAIL" error. Third-Party Digital Unlocking Tools Professional service tools like TFT UNLOCKER CM2 (Chinese Miracle 2)
often release "New Security" updates specifically designed to handle the 0x146 efuse error for brands like Vivo.
Check for the latest version of these tools, as they frequently update their exploit databases to handle "Brom Mode Closed" scenarios. Checklist for Success drivers and the latest MediaTek USB VCOM
drivers to ensure the PC can even see the device once you attempt a bypass. Device Status: Check if your device is
locked, as these enterprise-level locks often accompany the 0x146 efuse and require specialized removal. Do you have a specific device model (e.g., , Samsung A03) that you are trying to fix?
Knowing the model can help pinpoint the exact test point locations or required DA files.
Navigating the "BROM Disabled by efuse 0x146" Error: What It Means and How to Handle It
If you have been trying to flash a MediaTek device and encountered the error "BROM disabled by efuse 0x146", you’ve likely hit a significant security roadblock. This specific status code indicates that the manufacturer has permanently "blown" an electronic fuse (efuse) to disable the Boot ROM (BROM) mode, which is the low-level interface typically used for unbricking and custom flashing. What is the "efuse 0x146" Error?
On MediaTek platforms, the BROM is the "Root of Trust". It is the first code that runs when the chip powers on.
The 0x146 Status: This specific hex code typically signifies that the hardware-level security has been permanently locked. Manufacturers like Samsung (particularly on newer firmware bits like Bit 8) or Xiaomi use this to prevent unauthorized flashing, bypasses for KG Locked (Knox Guard) status, or MDM locks.
Permanent Lock: Unlike software locks, an efuse is a physical hardware change. Once blown, it cannot be "unblown." This disables the standard BROM entry via volume buttons or test points that most flashing tools rely on. The Challenge with Modern Security (KG/MDM)
This error most frequently appears on devices with KG Locked status. Even if you have the correct firmware, the device will refuse to flash because the "Chain of Trust" has been restricted at the hardware level.
Binary Restrictions: You may see accompanying messages like "all binaries are not allowed to be flashed due to kg locked".
Bypass Limitations: Many traditional bypass tools cannot re-enable BROM once this fuse is set, making standard "one-click" bypasses ineffective on newer security patches. Best Solutions and Workarounds
While "unblowing" the fuse is impossible, here are the most effective ways to handle a device in this state:
Use Authorized Flashing Tools: 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.
Fastboot Mode Recovery: If your device can still enter Fastboot mode, you may be able to flash a "Fastboot ROM" using official tools like Mi Flash Tool for Xiaomi or Odin for Samsung. This avoids the BROM interface entirely.
Hardware eMMC/UFS Intervention: In extreme "hard brick" cases where BROM is disabled and the device won't boot, technicians sometimes resort to removing the memory chip (eMMC/UFS) and programming it directly via a JTAG/ISP box, though newer security can sometimes even block memory-level FFU (Firmware Field Updates). brom disabled by efuse 0x146 best
MTK Client Tool: For some older or less restricted models, the MTK Client may still find a "backdoor" via the Preloader if the device developer options were previously enabled. Summary Table: BROM vs. Preloader Preloader Mode Level Hardware (Boot ROM) Software (First stage bootloader) Status with 0x146 Disabled (Hardware Fuse) May still be accessible Usage Unbricking from "Hard Brick" Standard firmware updates Requirement Often requires Auth/DA Requires signed official firmware
Note: 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 trying to bypass a lock or fix a bricked device, and what is the specific model you're working on?
The error "BROM disabled by efuse 0x146" is a hardware-level security restriction found on newer MediaTek (MTK) devices, particularly those from brands like Vivo. It indicates that the manufacturer has permanently "blown" an eFuse—a one-time programmable bit—to block access to the Boot ROM (BROM) mode. What This Error Means
Permanent Lock: eFuses are physical components that can be changed from 0 to 1 but never reversed. The 0x146 value specifically signals that the emergency BROM port is disabled.
Blocked Tools: Common software exploits and "one-click" tools (like earlier versions of MTKClient) that rely on forcing a BROM connection will fail because the hardware itself no longer listens for those commands.
Security Update: This is part of a "new security" patch level (often cited from 2022 onwards) designed to prevent unauthorized firmware flashing, FRP (Factory Reset Protection) removal, and bootloader unlocking. Potential Solutions & Workarounds
Because this is a hardware-level block, standard software "fixes" rarely work. However, community developers often find alternative entry points: Blown eFUSEs and disabling reading - NXP Community
The error message "BROM disabled by efuse 0x146" indicates a permanent hardware-level security lock on your device's MediaTek (MTK) processor. This typically occurs on newer devices (especially Vivo, Samsung, and Motorola) where the manufacturer has physically "blown" an electronic fuse (eFuse) to prevent unauthorized access to the BootROM (BROM) mode.
When this eFuse is active, traditional "software-only" exploits and standard button combinations to enter BROM mode will no longer work. 🛠️ Best Methods for Bypassing eFuse 0x146
Since the BROM is disabled at the hardware level, you must use methods that bypass the standard boot sequence or communicate directly with the device's storage. 1. Hardware Test Point (TP)
This is the most reliable "best" method for advanced users. It involves physically opening the device and shorting a specific point on the motherboard (often the CLK or DAT0 point) to ground while connecting it to a PC.
How it works: It forces the processor into a "handshake" state before the eFuse check can fully block communication.
Tool: You will need a specialized tool like UnlockTool, Pandora Box, or Chimera to send the "Exploit" command immediately after the device is detected via Test Point. 2. Preloader-to-BROM "Crash" Method
Some newer security patches allow you to "crash" the Preloader to force the device into BROM.
Procedure: Use a tool like MTK Client or UnlockTool. Select the specific model and the "Disable Auth" or "Force BROM" option.
Result: If successful, the tool "tricks" the preloader into failing, which sometimes drops the device back into a usable BROM state temporarily. 3. Authorized Flashing (Server-Based)
If hardware methods are too risky, you can use official manufacturer service tools that use an "Authorized Account."
Mechanism: These tools don't need BROM to be open; they communicate via the Preloader port using a digital signature from the manufacturer's server.
Cost: Usually requires a paid service or credit-based tools (e.g., Global Unlocker, SamHub for Samsung). ⚠️ Important Risks
Hard Brick: Attempting to force BROM on an eFuse-locked device can lead to a state where the device no longer turns on if the Preloader is corrupted.
Warranty: Opening the phone for a Test Point will void your warranty.
Permanent Lock: eFuses are physical; they cannot be "un-blown" or reset by software. If you'd like to proceed, please tell me:
What is the exact model of the device (e.g., Vivo Y21, Samsung A03)? Do you have access to paid tools like UnlockTool or Hydra?
Are you comfortable opening the device to perform a hardware Test Point?
I can then provide the specific Test Point diagram or the correct software settings for your model.
It looks like you have encountered a specific hardware state, likely related to an Allwinner (sunxi) based device, such as an Android TV box, tablet, or development board (like Orange Pi or NanoPi).
Here is an explanation of what that message means, why it appears, and the reality of the "best" solution. "BROM disabled by efuse 0x146" is a hardware-level
The error "BROM disabled by efuse 0x146" is a security sentinel that signals your MediaTek device has been permanently locked against unauthorized flashing. However, "permanent" in the world of hardware hacking is rarely absolute.
The "best" fix is not a single magic button—it's a combination of the right tool, the right bypass payload, and deep understanding of MediaTek’s security architecture. Do not throw the phone away. But do not waste hours with the same broken DA file.
Remember: eFuse 0x146 is blown. You cannot un-blow it. You can only find a way to work around it.
Do you have a specific device showing "BROM disabled by efuse 0x146"? Leave a comment with the model number (e.g., Redmi 10C, Infinix Hot 11) and the exact tool you are using for targeted advice.
"BROM disabled by efuse 0x146" is a security measure implemented by manufacturers (most notably on
devices like Vivo, Samsung, and Oppo) to block unauthorized access to the BootROM (BROM) mode. This prevents common "one-click" bypass tools from exploiting the device for FRP (Factory Reset Protection) removal, unlocking, or flashing. Understanding Efuse 0x146 Physical Lockdown
: The "efuse" is a microscopic fuse within the CPU. Once "blown" (set to a specific value like 0x146), it permanently disables certain hardware pathways, such as the emergency BROM port. Security Evolution
: 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
: While some older security patches disabled BROM via software (which could be bypassed by shorting a CLK pin to ground), the
status often indicates a hardware-level lock that makes traditional "Test Point" methods much more difficult or impossible on certain models. Best Solutions for 0x146
Since standard BROM exploits are blocked, you must use methods that target the mode instead of the BootROM: Preloader Auth Bypass : High-end servicing tools like the Unlock Tool UMT (Ultimate Multi Tool)
have updated their protocols to communicate through the Preloader port rather than forcing BROM. Custom DA/Preloader Files
: For many Vivo and Samsung MTK devices, you must select the specific model in your tool and use a "Custom Preloader" or "Custom DA" (Download Agent) file that is compatible with the new 2023+ security patches. VBOOT/Meta Mode : Some operations can still be performed in Factory Mode , which do not require the BROM exploit to function. Hardware Test Points
: If software-only methods fail, you may still need to find a physical Test Point
on the motherboard to force the device into a state where the Preloader can be overwritten, though this is increasingly rare for 0x146-level security. Recommended Tools Unlock Tool
: Widely considered the most frequent updater for bypassing "New Security" on MediaTek. Pandora Box
: Known for stable Preloader-based communication for Samsung and Vivo devices. DFT Pro / Hydra Tool
: Alternative professional suites that support "Force Brom Fail" solutions. Are you working on a specific model
(e.g., Vivo Y21, Samsung A03s) so I can provide the exact test point or tool configuration?
Dealing with the "BROM disabled by efuse 0x146" error can be a major roadblock when trying to flash or unbrick MediaTek (MTK) devices. This error specifically indicates that the device's Boot ROM (BROM) has been permanently locked via an electronic fuse (efuse), preventing standard low-level flashing tools from communicating with the processor. What Does This Error Mean?
The 0x146 code is a security flag. It means the manufacturer (often Xiaomi, Vivo, or Oppo) has "blown" a hardware fuse to disable the BROM Mode (MTK USB Port). This is a security measure to prevent unauthorized firmware changes, FRP bypasses, or bootloader unlocking using standard exploits. Best Methods to Fix or Bypass
Since the hardware BROM is disabled, you must use alternative entry points to communicate with the device.
Preloader Mode (The Standard Workaround):Since BROM is locked, you must flash through the Preloader port instead. In tools like SP Flash Tool or MTK Auth Bypass tools, ensure you are selecting "Preloader" as the connection type rather than "BROM."
Auth Bypass Tools:Use updated versions of tools like MTK Client, Pandora, or UnlockTool. These tools have specific scripts to "handshake" with the Preloader and force the device into a state where it can accept commands despite the blown efuse.
Test Point Method:If software-only methods fail, you may need to open the device and short a specific Test Point on the motherboard to GND (Ground) while connecting the USB cable. This physically forces the processor into a flash-ready state, sometimes bypassing the efuse check.
Updated DA (Download Agent) Files:Modern MTK devices with high security require a "Secure DA" file. Ensure you are using the exact .bin or .auth file matched to your specific model and firmware version to satisfy the security handshake. Key Tools for the Job
MTKClient: An open-source favorite that often handles efuse-protected devices better than official tools.
UnlockTool (Paid): Highly recommended for its "Disable Auth" and "Force BROM" features tailored for newer security patches. For beginners: Accept that the device cannot be
SP Flash Tool (v6.x or higher): The newer versions are designed to handle the V6 authentication architecture found in devices showing the 0x146 error. Pro-Tip for Flashing
If you are using SP Flash Tool and see this error, go to Options > Connection and make sure the "Connection Type" is set to UART or USB (depending on your cable), and try unchecking the "Auto Detect" feature to manually select the Preloader port once the device is connected.
Which device model and specific tool are you currently using to flash?
The error message "BROM disabled by efuse 0x146" typically occurs on Samsung devices with MediaTek (MTK) processors when a security mechanism, often related to Knox Guard (KG Lock), has permanently blown a hardware fuse to prevent low-level flashing via Boot ROM (BROM) mode.
While a single "best" definitive article does not exist, the most helpful resources and community consensus point to the following solutions: Understanding the Lock
Hardware Restriction: The 0x146 value indicates that the BROM (Boot ROM) is physically disabled by an electronic fuse (efuse). This means standard MTK flashing tools (like SP Flash Tool) cannot communicate with the device in its base state.
KG Status: This is frequently seen on devices that are KG Locked (Cloud locked by a financing company or carrier). The lock prevents the device from accepting unauthorized ROMs or modifications. Common Fixes & Workarounds Test Point (Hardware Bypass):
To force the device into BROM mode despite the efuse, technicians often use a Test Point method.
This involves opening the phone and temporarily grounding a specific point (often the CLK or CMD pin) on the motherboard while connecting it to a computer.
Caution: This requires physical disassembly and specific "bitmap" diagrams for your exact phone model to avoid shorting the wrong components. ADB Method (If OS is Accessable):
If the phone still boots into Android, you can try bypassing the lock using ADB commands.
Some technicians use specialized software like the TSM Tool Pro or Chimera Tool to "Disable KG Locked MTK ADB".
This usually requires entering a test mode by dialing *#0*# in the emergency dialer to enable ADB. Wipe Data/Factory Reset:
A deep reset via recovery mode (Volume Up + Power) is often the first step before attempting software bypasses. Recommended Discussion Platforms
For the most up-to-date scripts and "patched ROMs" specifically for this 0x146 error, community forums are your best bet:
Global Fix Central frequently discusses efuse 0x146 and remote service bypasses.
Search for "Samsung KG Unlock ADB Method" on YouTube for visual walkthroughs of the test mode exploit.
Warning: Bypassing KG locks may violate terms of service or local laws regarding financed devices. Always ensure you have legal ownership before proceeding.
| Prevention | Action |
|------------|--------|
| Never flash preloader from an unknown source. Uncheck PRELOADER in SP Flash Tool. | ✅ |
| Do not downgrade from Android 11 to 10 or 9 on MediaTek. | ✅ |
| Block OTA updates if you plan to flash custom ROMs. | ✅ |
| Backup full firmware (including preloader) before updating. | ✅ |
| Use MTK Client or SP Flash Tool readback before making changes. | ✅ |
| Cause | Explanation | |-------|-------------| | Official OTA Update | The update included a new preloader that blew the eFuse. | | Downgrade Attempt | You tried to flash an older stock ROM or a custom ROM not signed by the manufacturer. | | Security Patch (>= 2019) | MediaTek introduced "BROM Protection" after the SP Flash Tool leak (SLA/DAA). | | Used Wrong Scatter File | Flashing a preloader from a different phone model can trigger this lock. |
Crucial note: Once eFuse 0x146 is blown, it cannot be reversed. It is a physical, one-time change. You cannot "un-blow" an eFuse.
0x146 (or the specific bit it represents) typically controls Secure Boot or disables the FEL mode (USB boot mode).Look for markings on the main chip (e.g., RK3566, RK3588, Allwinner, Amlogic). Different vendors use different error codes.
If eFuse 0x146 truly disables BROM execution permanently:
Now, we connect the dots.
When you see "BROM disabled by efuse 0x146", you are looking at a security response from the MediaTek BROM. Here’s exactly what it means:
0x146 is tied to the SLT (System Level Test) or Debug Authorization Policy.In plain English: Your device has blown a physical fuse inside the CPU that tells the BROM to permanently ignore all external flashing attempts via the standard download agent (DA).
This is MediaTek’s answer to unauthorized repairs, clone devices, and security exploits. Once this fuse is blown, the device can only be flashed using an authenticated, signed DA from the manufacturer.
The best solution is prevention. Follow these rules:
