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Some tools can still work in if the device allows it. The Preloader is the first piece of code loaded by the BROM, and it still runs (otherwise the phone could not boot Android at all). In Preloader mode, you may be able to perform certain operations:
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 your device is still under warranty, contacting the manufacturer or the seller might be the best course of action. They may be able to repair or replace the device. brom disabled by efuse 0x146
Instead of choosing an "MTK Universal / BROM" option, manually select your exact phone model and select or EMI (Preloader) Force .
Preventing users from reverting to older, vulnerable versions of Android. Bootloader Unlocking: Some tools can still work in if the device allows it
But what if a bug is found in that ROM after millions of chips are sold? You can't change hardware. So designers include efuses —tiny electronic fuses you can blow once. Each blown fuse changes a configuration bit forever.
Traditional MTK bypass utilities (which exploit USB stack vulnerabilities) fail instantly because the chip drops the connection before executing the vulnerability exploit. While holding the short, plug in the USB cable
A failed flashing attempt, tampering, or a KG lock (often on Samsung, but similar mechanisms exist for MTK) can trigger the burning of the EFuse.
From a servicing point of view, the BROM is extremely valuable because it can be triggered even when the main flash is empty, corrupted, or boot‑looping. By shorting specific on the mainboard, you can force the device into BROM mode. In this mode, specialised tools—SP Flash Tool, various commercial “boxes” (Z3X, Pandora, etc.), or open‑source tools like mtkclient—can communicate directly with the chip, bypass many security checks, and perform low‑level operations such as:
This is a common hurdle in the device modding and repair community. Manufacturers and carriers often blow this fuse to prevent: Unauthorized Firmware Downgrades:
