BROM mode exposes a direct USB connection to a computer before any operating system, recovery partition, or secondary bootloader (Preloader) initializes.
The only correct way to bypass the 0x146 restriction is to use an signed with a key that matches the efuse configuration. Unauthorized DAs (like the generic MTK_AllInOne_DA.bin ) will fail immediately.
It looks like you have encountered a specific hardware state, likely related to an , such as an Android TV box, tablet, or development board (like Orange Pi or NanoPi).
When you see this error, it means the manufacturer has burned an eFuse that tells the processor to ignore "Force BROM" commands. This is part of a "New Security" update designed to prevent users from using common bypass tools (like UMT, Hydra, or MCT) to circumvent authentication. Why Manufacturers Disable BROM
: This is often the most reliable "best" fix. You must open the device and short a specific point (CLK or CMD) on the motherboard to ground while connecting the USB cable. This bypasses the software-level BROM block and forces the device into a usable state for tools like ChimeraTool Preloader Mode (Software) brom disabled by efuse 0x146 best
Use fine-tipped metal tweezers to bridge the designated test point pad to the nearest copper grounding shield.
Below are the working strategies, ranked from most effective to least.
user wants a long article about the keyword "brom disabled by efuse 0x146 best". This appears to be a technical topic related to embedded systems, possibly Allwinner SoCs. I need to provide detailed information. I will follow the search plan. search results primarily show GSM-Forum posts about Vivo and Samsung devices, not Allwinner. The keyword "brom disabled by efuse 0x146" appears frequently. The search for Allwinner-related terms yielded some results but not directly on point. I need to gather more information from these results. I will open the relevant GSM-Forum posts and the linux-sunxi page. search results show many forum posts about the error "Brom disabled by Efuse[0x146]" on various MediaTek devices (Vivo, Samsung). There's also some technical documentation on eFuse BROM configuration from artinchip.com and linux-sunxi.org, though the latter may be more general. For a long article, I need to cover the meaning of the error, affected devices, causes, diagnosis, solutions (workarounds), and future outlook. I should also consider the possibility that the user might be interested in the technical details of eFuse and BROM. I will structure the article accordingly. I will search for more specific information on MediaTek bootrom and SLA/DAA authentication. search results show various GSM-Forum posts with different error codes (0x102, 0x10F, 0x142, 0x14E, 0x307). The user's query is specifically about 0x146. I will gather information from these results. search results provide a wealth of information. I will structure the article to cover: understanding the error, affected devices, the cause (eFuse and security), why it's a dead end, analysis of the 0x146 error, potential workarounds, and the future outlook. I will cite the sources appropriately. Now I will write the article. BROM Disabled by Efuse [0x146] error is a common and often fatal obstacle encountered when attempting to repair or service many modern smartphones, particularly those powered by MediaTek processors. For technicians and advanced users, it represents the end of the road for many traditional repair methods. This article provides a comprehensive overview of this error, explaining its technical background, how to identify it, and the current state of solutions.
Manufacturers use these fuses to enforce critical security policies. For example, once the most secure boot process (e.g., Secure Boot) is confirmed to be working on a device, the manufacturer can blow an eFuse to permanently disable access to low-level test modes like the full BROM interface. This prevents any future exploit or tool from downgrading the boot process or installing unauthorized software. BROM mode exposes a direct USB connection to
: Boot the phone explicitly into Download Mode (holding both volume buttons while plugging into a PC). Use the official Samsung Odin flashing utility to install an identical or higher binary-level official stock firmware file. This can restore a bootlooping or corrupted device without ever needing to touch the locked BROM protocols. 4. Specialized Servicing Boxes (1-Click Fixes)
For technicians: Only an authorized EMI authentication file or direct eMMC programming (JTAG/ISP) can bypass this — and that requires factory-level credentials or hardware intervention.
When the BROM checks this efuse at boot, it finds that the bit is . The configuration at 0x146 tells the BROM: "Do not allow any unauthorized or unauthenticated download agent (DA) to run. Disable DMA access. Force a secure handshake only."
Once eFuse 0x146 is blown, it cannot be reversed . It is a physical, one-time change. You cannot "un-blow" an eFuse. It looks like you have encountered a specific
Since the hardware BROM is disabled, you must use alternative entry points to communicate with the device.
Click the desired service action (e.g., Erase FRP or Factory Reset) and connect the phone while holding both volume keys without any hardware modifications first. Step 2: Isolate the Hardware Test Point
Never rely on BROM access for custom firmware development. Always unlock the bootloader via fastboot before the device bricks.