Brom Disabled By Efuse 0x146 Jun 2026

Most modern professional tools (like UnlockTool or Hydra) now have an option to flash via .

Understanding the "BROM Disabled by efuse 0x146" Error If you are trying to unbrick, flash, or bypass the Factory Reset Protection (FRP) on a MediaTek (MTK) device and encounter the error you have hit a significant security roadblock.

For newer Xiaomi, Oppo, and Vivo devices with efuse 0x146 , the BROM is locked to secure servers. The device will only open its boot gates if it receives a cryptographic handshake from the manufacturer's server.

A read-only memory area hardcoded into the MediaTek CPU chip during manufacturing. It cannot be altered by software. BROM handles the absolute lowest level of USB communication when a device is forced into a flash state. brom disabled by efuse 0x146

If hardware grounding is ineffective or dangerous for your specific model, the only recourse is utilizing authorized vendor service software. Tools like Samsung's (via Download Mode) or official Xiaomi Mi Flash tools bypass BROM restrictions entirely. They flash the phone by utilizing secure, cryptographic server handshakes that authorize changes directly through an untouched, factory-signed Preloader structure. Summary Table: BROM Mode vs. Preloader Mode BROM Mode (Exploited) Preloader Mode (eFuse 0x146 Safe) Chip Level Silicon Hardcoded (CPU) Storage Partition (eMMC/UFS) Status after 0x146 Disabled permanently via eFuse Active and serviceable Connection Method Volume Keys or Autodetect Model-specific Preloader targeting Hardware Required Standard USB data cable Tweezers/Jumpers for Test Points (if bricked) Main Use Case Global unlocks and formatting Recovery, official firmware restoration Conclusion

Use metallic tweezers to short the specific test point pin to the phone's metal shield (Ground). While holding the short, plug in the USB cable.

If BROM is unavailable, some operations can still be performed in Factory Mode These modes do not require the BROM handshake. Most modern professional tools (like UnlockTool or Hydra)

brom disabled by efuse 0x146 is the chip's way of saying, "I have been permanently configured to distrust my own starting code. You cannot wake me the old way. Bring a new chip or the correct secure boot image—there is no back door."

For some high-security devices (like newer Xiaomi or Oppo models), the only way to bypass this is using an . The tool connects to the manufacturer's server, verifies a digital signature, and "unlocks" the path for the flash tool to proceed despite the fuse status. Summary for Technicians If you see 0x146 :

Map eFuse bits to meaning

Because an eFuse is a physical change to the chip, you cannot "un-blow" the fuse or reprogram it back to its original state. However, you can change your repair strategy to work around it. Here are the proven methods to bypass this restriction: 1. Use Preloader Mode Instead of BROM Mode

Here is a comprehensive guide to what this error means, why it happens, and the actionable methods you can use to bypass or resolve it. What is the MediaTek BROM?

For the repair community, this means: