Manufacturers burn this specific fuse during factory assembly—or via mandatory Over-The-Air (OTA) firmware updates—to stop unauthorized third-party software installations, prevent device cloning, and block low-level exploits. 3. Why Do Manufacturers Disable BROM?
Because EFuse is a physical, hardware-level restriction, you cannot simply flash a new file or use a special tool to "turn it back on." According to GSM-Forum and GSMHosting , "there is no solution for enable brom". However, technicians often look for alternative paths: 1. Preloader Mode Attempt
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The chip directly mandates security authorization through the digitally signed file or official vendor server authentications.
When a servicing tool outputs Brom disabled by Efuse[0x146] , it means the device attempted to activate BROM mode but was prevented by the processor's internal eFuse configuration. The hexadecimal value is a vendor‑specific identifier indicating which particular fuse or fuse set has been programmed to disable BROM. brom disabled by efuse 0x146
Secure boot will still check signatures. You can only write signed firmware.
When you power on a MediaTek smartphone, the very first piece of code that runs is not from the main flash storage. It comes from a tiny, read‑only memory built into the silicon itself: the Boot ROM, abbreviated as or BootROM . This initial code initialises the most basic hardware (clocks, memory controller) and then looks for the next piece of software, normally the Preloader , which then loads the main bootloader and finally the Android system. Because EFuse is a physical, hardware-level restriction, you
The tool will target the MediaTek Preloader USB VCOM port instead of the MediaTek USB Port (BROM) . Method B: Physical Test Points (Hardware Grounding)
If the preloader or boot partitions become corrupted on a device with a blown BROM fuse, recovering the phone becomes exceptionally difficult, as there is no built-in safety net to accept fresh firmware. 5. How to Work Around "BROM Disabled by eFuse 0x146" When a servicing tool outputs Brom disabled by