Brom Disabled By Efuse 0x146 <RECENT>

Map eFuse bits to meaning

Some devices require an official service account to flash via "Download Mode" or "EDL" instead of BROM.

Manufacturers like Xiaomi, Oppo, Realme, Vivo, and Samsung use this mechanism to prevent unauthorized flashing, data extraction, and software modification. There are two primary reasons you are seeing this error:

Shorting the clock line forces a physical interruption between the CPU and the flash storage, occasionally forcing the CPU back into a hardware emergency boot state that bypasses the standard eFuse routine checks. Method C: Server Authentication / Official Flash Tools brom disabled by efuse 0x146

This report details the technical implications of the eFuse setting 0x146 resulting in the disablement of the Boot ROM (BROM). In the context of System-on-Chip (SoC) architecture—most notably within specific Rockchip series (such as the RK3399 and derivatives)—the BROM is the first-stage bootloader responsible for initializing hardware and loading subsequent boot stages.

On some models, physically shorting the CLK (Clock) or VCORE pin to Ground (GND) on the motherboard can sometimes bypass the software-level block, though this is increasingly rare on the newest security patches.

Select the option forced to communicate via instead of BROM. Map eFuse bits to meaning Some devices require

By shifting your approach from forcing BROM to utilizing a secure, updated Preloader connection, you can successfully service devices carrying the efuse 0x146 security lock.

The device may only boot to Fastboot or a logo, but lacks BROM access for repairs. ⚠️ Known Solutions (and Dead Ends)

began implementing this in late 2022 to block common "One-Click" bypass tools that relied on BROM vulnerabilities. Broken Bypass Method C: Server Authentication / Official Flash Tools

The tool will target the MediaTek Preloader USB VCOM port instead of the MediaTek USB Port (BROM) . Method B: Physical Test Points (Hardware Grounding)

If you're not comfortable attempting fixes yourself or if the device is no longer under warranty, seek professional help.

eFuses (Electronic Fuses) are one-time programmable memory bits. They are used to store permanent configuration data, such as:

Using official service tools (like MiFlash for Xiaomi or Odin for Samsung) with an authorized technician account can sometimes still write to the device.

For many newer locked devices, companies require secure server authentication to flash firmware.