Brom Disabled By Efuse 0x146 Best May 2026

Summary: Your device has been permanently locked by the manufacturer at the factory. The message brom disabled by efuse confirms that the security mechanisms are active and working as intended. You will likely not be able to flash generic or third-party firmware onto this unit.

The only correct way to bypass the 0x146 restriction is to use an authenticated Download Agent (DA) signed with a key that matches the efuse configuration. Unauthorized DAs (like the generic MTK_AllInOne_DA.bin) will fail immediately.

If error persists, eFuse likely disabled USB download mode.

An Efuse (Electronic fuse) is a one-time programmable (OTP) memory cell inside the SoC. Once a bit is "burned" from 0 to 1, it can never be changed back. Manufacturers use efuses to: brom disabled by efuse 0x146 best

To understand the error, you must first understand BROM.

BROM (Boot ROM) is a tiny, read-only memory chip embedded inside the main processor (SoC—System on Chip) of your MediaTek-powered device. It holds the very first code that runs when you power on your phone. Think of it as the BIOS of a computer, but more primitive and immutable.

BROM’s job is simple:

This "download mode" is what tools like SP Flash Tool, Miracle Box, and CM2MT2 exploit to flash firmware, repair IMEI, or remove FRP. For years, this backdoor was wide open.

Some large repair services or firmware websites provide:

How to use:

Warning: This only works if the auth file matches your exact eFuse key. Almost impossible for regular users.

The eFuse 0x146 is typically blown under these scenarios: