Brom Disabled By Efuse 0x146 Best Updated
: While some older security patches disabled BROM via software (which could be bypassed by shorting a CLK pin to ground), the
The error message is a low-level hardware security status that prevents technician tools from accessing the Boot ROM (BROM) mode on MediaTek (MTK) chipsets, primarily seen on modern Samsung Galaxy devices. This hardware-level lock is triggered by Knox Guard (KG) security or modern firmware updates to stop unauthorized flashing, unlocking, or bypassing of MDM locks.
Modern servicing tools have evolved to target the stage rather than the BROM stage. The Preloader is a secondary bootloader written to the device's flash storage (EMMC/UFS).
The "disabling" of this BROM is achieved through an eFuse. Unlike software configurations that can be flipped or reset, an eFuse (electronic fuse) is a physical alteration of the silicon. Sending a specific high current through a microscopic wire physically breaks it, changing the electrical state from a logical 0 to a logical 1 permanently. In this context, bit 0x146 is a kill switch. When this bit is "blown" (programmed), the SoC hardware logic is altered to bypass or ignore the BROM’s interactive modes. Specifically, it disables the ability to enter the download or rescue mode via standard hardware interrupts (like holding a reset button during boot).
drivers to ensure the PC can even see the device once you attempt a bypass. Device Status: Check if your device is brom disabled by efuse 0x146 best
[ Motherboard PCB ] ┌───────────────────────┐ │ │ │ [CLK] ○ ──┐ │ <-- Short these two points using tweezers │ [GND] ○ ──┘ │ while connecting the USB cable. │ │ └───────────────────────┘
It tells your computer: "I see you're trying to talk to my BROM, but my hardware instructions say that BROM is now forbidden." ⚡ Is there a "Best" solution?
If the BROM is permanently dead, you can bypass the processor entirely. Technicians solder thin wires directly to the motherboard's memory pins ( CMD , CLK , DAT0 ). This allows an external box to read/write directly to the storage flash chip to clear FRP or MDM configurations without the processor ever turning on. 4. Authorized Server-Side Authentication
Select the option to flash or bypass using this authenticated file instead of relying on the generic MTK bypass script. 3. Hardware Test Point (ISP / EDL Method) : While some older security patches disabled BROM
When a phone receives an official OTA (Over-The-Air) update or a specific security patch (usually Android 9, 10, 11, or 12 with MediaTek), the manufacturer "blows" the eFuse at address 0x146 . This permanently tells the BROM: "Do not accept unsigned or unauthorized flash operations."
If you are still receiving the 0x146 error during your flash sequence, check for these common faults:
The error message is a critical security message encountered on MediaTek (MTK) chipset-powered devices. It signifies that the device's Boot Read-Only Memory (BROM), which handles early-stage booting and firmware flashing, has been permanently disabled via a physical security measure known as an eFuse .
If you change your tool configuration and still run into errors or disconnects, walk through these troubleshooting steps: The Preloader is a secondary bootloader written to
: Known for stable Preloader-based communication for Samsung and Vivo devices. DFT Pro / Hydra Tool
If the device has a high security patch that completely blocks Preloader communication, you must use a physical . This bypasses the eFuse check by grounding a specific data line on the motherboard during the boot cycle.
Because the hardware BROM mode is permanently turned off, standard software bypass tools will not work on their own. You must use specialized hardware tricks or software options designed to work through the Preloader instead. 1. The Preloader Exploit Method (No Test Point)
Load this custom Preloader file manually into your servicing tool (e.g., SP Flash Tool, Miracle Box, or Hydra Tool).
Once fuse 0x146 is blown, the CPU is hard-wired to ignore commands from BROM mode. Software tools like SP Flash Tool, UnlockTool, or MTK Client will fail because the hardware itself is no longer listening. 📖 The "Informative Story" of Security Patching Phase 1: The Golden Age of Exploits