Brom Disabled By Efuse 0x146 -

Based on numerous community reports, here are some of the most common devices that throw the “Brom disabled by Efuse[0x146]” error:

The technician uses a certified OEM server account to sign the challenge.

Connect the phone to the computer (or by holding just Volume Down).

– Rarely, a driver issue mimics 0x146. brom disabled by efuse 0x146

Since the CPU bypasses BROM, it hands off communication directly to the partition. Modern servicing tools use customized DA (Download Agent) configurations or authentication handshakes via the Preloader interface.

: In recent years, researchers discovered critical vulnerabilities in MediaTek's BROM code (such as the famous Kamakiri exploit). These allowed users to bypass security, read data, and remove locks without a password. Disabling BROM kills these hardware exploits entirely.

began implementing this in late 2022 to block common "One-Click" bypass tools that relied on BROM vulnerabilities. Broken Bypass Based on numerous community reports, here are some

JTAG / ICE / debug connectors

While you should check if the device can enter Preloader mode to attempt a stock firmware flash, be prepared that the device may require professional hardware repair or JTAG servicing to function again.

When this fuse is blown, common "MTK One-Click" tools and "Auth Bypass" scripts that rely on forcing the device into BROM mode will fail. The device will no longer create the MediaTek USB VCOM port when you press volume buttons and connect it to a PC. Why Manufacturers Use It Since the CPU bypasses BROM, it hands off

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

Manufacturers use this to prevent "unauthorized" flashing or bypassing of security features. By blowing this fuse, the phone is instructed to ignore standard BROM entry commands (like holding Volume buttons while plugging in the USB). Instead, the device will only communicate through higher-level, more secure modes like . Common Scenarios for this Error

This lock is primarily a defense against unauthorized modifications and exploits. Common reasons for this state include:

An "efuse" is a microscopic hardware fuse inside the processor. Once it is "blown" (electronic state changed), it cannot be undone.