Brom Disabled By — Efuse 0x146

Use JTAG / ISP / hardware-level access

protections are active, and the standard BootROM download mode has been intentionally restricted or disabled by the manufacturer. BROM (BootROM) : The initial code executed by the processor upon power-on.

If the Preloader file matches your device secure configuration, the flashing process will start. Method 2: Utilize the Test Point Method (Hardware Force)

I can then provide specific or the correct DA/Preloader files for your model.

Verify if a specific bypasses the BROM check on your specific chipset. brom disabled by efuse 0x146

[Your Name/Handle] Independent Hardware Security Research

When a phone has efuse 0x146 activated, its boot path changes significantly.

When the BROM interface is permanently severed by the 0x146 eFuse, traditional servicing methodologies completely change. Feature / Capability Pre-eFuse 0x146 State Post-eFuse 0x146 State Fully functional; allows authentication bypass. Blocked ; USB connection drops or errors immediately. Preloader Mode Access Accessible for standard firmware flashing. Limited ; requires strictly signed vendor firmware. KG / MDM Bypass Achievable using generic MTK click tools. Blocked via standard low-level software tools. Dead-Boot Unbricking Easy to recover via low-level flashing.

Notable SoCs where 0x146 appears:

Practical step: In SP Flash Tool, go to Options > Authentication File and load the corresponding auth_sv5.auth file before connecting the device.

The error message brom disabled by efuse 0x146 is not a random glitch but a deliberate, silicon-enforced lockdown. Understanding this eFuse’s role helps hardware security engineers, forensic analysts, and repair technicians differentiate between recoverable boot failures and permanent SoC bricking. As eFuse usage grows in IoT and mobile devices, similar “BROM disable” patterns will appear with different addresses (e.g., 0x200, 0x302). Documentation of these values is essential for open-source repair and security research.

Rarely, eFuse only affects USB BROM, not JTAG. But on modern MTK, both are fused.

Priya connected her JTAG debugger and fired up the serial console. The terminal spat out the usual bootrom chatter—initializing PLLs, setting up stack pointers—and then stopped dead. Use JTAG / ISP / hardware-level access protections

Look for, verify, and load the next boot stage (the ).

on modern MediaTek devices (post-2020).

The causes can vary but typically include: