The error often appears during routine maintenance like flashing firmware, removing FRP locks, or unlocking the bootloader. It usually happens when the device has been updated to a newer security patch that permanently activates the fuse.
Once downgraded, verify if the standard BROM communication port opens properly. 4. Authorized Server Flashing (Auth Bypass)
: If the security is not the absolute latest, you can try the Python-based MTK Bypass Utility brom disabled by efuse 0x146 best
is the first piece of code that executes on a processor when it is powered on. It acts as a failsafe, low-level "factory mode" that can communicate with flash memory independent of the main operating system. For years, this mode has been the ultimate backdoor for technicians to perform operations like flashing firmware, removing FRP (Factory Reset Protection), or repairing IMEI numbers, even on bricked or otherwise non-functional phones.
The presence of "BROM disabled by eFuse" indicates a permanent hardware lock. This means that no amount of button pressing, battery removal, or "test point" (TP) shorting will grant you full BROM access. The error often appears during routine maintenance like
To understand the problem, one must understand what an eFuse is. An eFuse is an "electronic fuse"—a microscopic, one-time programmable memory cell integrated into the SoC. The key property of an eFuse is that it is OTP (One Time Programmable); once a bit is changed from 0 to 1, it is permanently set and can never be reverted.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. For years, this mode has been the ultimate
[Computer] ---> [JTAG / ISP Box] ---> [Motherboard Test Points] ---> [Flash Memory]
Tools like MTK Client (Python tool by bkerler) and UnlockTool have developed methods to bypass this authentication using a brom payload that ignores the eFuse check.
Free tools often fail against 0x146. Commercial boxes are updated constantly to defeat new eFuse mechanisms.