Priya checked the datasheet. The prototype had been through an "efuse programming" step to lock down production units. Someone had accidentally run that script on her development board.
If you repair, flash, or mod MediaTek‑based devices, you’ve likely seen this dreaded error:
Check if your specific tool (like MTKClient) has a "Crash Preloader" or "Force BROM" exploit for your specific chipset. Developers occasionally find bugs in the Preloader that allow them to jump back into a BROM-like state.
The error message "BROM disabled by efuse 0x146" is a security state found in modern MediaTek (MTK) based smartphones, particularly from brands like brom disabled by efuse 0x146
Your device received a recent OTA update that permanently disabled BROM access to prevent the use of "MTK Auth Bypass" tools.
Use fine-tipped tweezers or a jumper wire to . While holding the short, plug in the USB cable.
| | Model(s) Reported | | --------------- | ----------------------------------------------- | | Vivo | V2139, Y21, Y21A, Y15S (V2120), Y53s 4G (V2109) | | Samsung | A037M, A107F, S134DL, S215DL | | BLU | Various models with MT6761 (Helio A22) | | TCL | T433D | | Honor | X7a | | Motorola | Edge 60 Fusion | Priya checked the datasheet
Disassemble the smartphone to access the printed circuit board (PCB).
The device hardware is hard-coded to reject BROM instructions unless a specific RSA signature is provided.
: Some devices may require an official service account (Server Auth) to flash files once BROM is disabled. Hardware Modification If you repair, flash, or mod MediaTek‑based devices,
: Unlike software locks, an eFuse is a physical change on the chip that cannot be "undone" by software alone. Security Updates : Manufacturers like
Once the eFuse is blown, the BROM is gone forever. No software update, no test point, no boot‑loader trick, no firmware reflash can bring it back. The chip is physically programmed to deny BROM access for the rest of its life.
eFuse is an electronic fuse that is used in many modern devices, including those with MediaTek chipsets. It's a mechanism that allows the device manufacturer to control and configure various aspects of the device's behavior, including the boot process. eFuse can be used to disable certain features or components of the device, effectively bricking or rendering it unusable if needed.
In practice, the error appears in the logs of flashing tools after the tool has successfully initialised the chip, but just when it tries to gain deeper BROM access:
brom disabled by efuse 0x146 has been observed in: