Brom Disabled By Efuse 0x146 Best Hot! »

Attempting to force BROM on an eFuse-locked device can lead to a state where the device no longer turns on if the Preloader is corrupted.

Only for professional repair centers with BGA rework stations. Cost almost always exceeds the value of the phone.

The error is a security sentinel that signals your MediaTek device has been permanently locked against unauthorized flashing. However, "permanent" in the world of hardware hacking is rarely absolute.

[Device Power On] │ ▼ [Check eFuse Status] ──(Flag 0x146 Blown?)──► YES ──► BROM Port Killed Completely │ │ ▼ NO ▼ [Standard BROM Mode Open] [Force Preloader Only] The Best Methods to Bypass eFuse 0x146 brom disabled by efuse 0x146 best

For the error, a Z3X supporter advised, "Hello. BROM fused. Try with advanced preloader auth". However, this is not a guaranteed fix. Attempting this on a Vivo Y21A resulted in another error: "Send bootloader... error(DA_INIT_KEY_FAIL). Advanced Authorization (Preloader) not supported for this preloader version".

Instead of "Force BROM," let the device connect via its Preloader port.

Plug in the device while holding the Volume Down button to step into the purple/green Meta Mode screen environment. Attempting to force BROM on an eFuse-locked device

| Cause | Explanation | |-------|-------------| | | The update included a new preloader that blew the eFuse. | | Downgrade Attempt | You tried to flash an older stock ROM or a custom ROM not signed by the manufacturer. | | Security Patch (>= 2019) | MediaTek introduced "BROM Protection" after the SP Flash Tool leak (SLA/DAA). | | Used Wrong Scatter File | Flashing a preloader from a different phone model can trigger this lock. |

Here are the most common scenarios in which you will see this error:

Some technicians use specialized software like the TSM Tool Pro or Chimera Tool to "Disable KG Locked MTK ADB". The error is a security sentinel that signals

Are you trying to or fix a bricked device , and what is the specific model you're working on?

The "best" fix is not a single magic button—it's a combination of the right tool, the right bypass payload, and deep understanding of MediaTek’s security architecture. Do not throw the phone away. But do not waste hours with the same broken DA file.

Easy JTAG , Medusa Pro , or Octopus Box with a proper pinout diagram.

This article provides the technical breakdown and practical solutions for the "BROM disabled by efuse 0x146" error. We will explore what BROM and eFuse are, why 0x146 specifically appears, and the most effective strategies to bypass or resolve it.

For modern devices with heavily restricted eFuses, manufacturers require an authorized server token to authorize BROM access.