The error is a hardware-level security restriction found on newer MediaTek (MTK) devices, particularly those from brands like Vivo . It indicates that the manufacturer has permanently "blown" an eFuse—a one-time programmable bit—to block access to the Boot ROM (BROM) mode. What This Error Means
Use tweezers to connect that specific point to the copper grounding shield.
[Computer] ---> [JTAG / ISP Box] ---> [Motherboard Test Points] ---> [Flash Memory]
[ Motherboard PCB ] ┌───────────────────────┐ │ │ │ [CLK] ○ ──┐ │ <-- Short these two points using tweezers │ [GND] ○ ──┘ │ while connecting the USB cable. │ │ └───────────────────────┘
Select your exact device brand and model configuration rather than using a generic "MediaTek Universal" profile. brom disabled by efuse 0x146 best
Tools like SP Flash Tool can still detect the phone, but the second they try to send a "DA" (Download Agent), the BROM rejects it and throws error 0x146 .
For modern devices with heavily restricted eFuses, manufacturers require an authorized server token to authorize BROM access.
have updated their protocols to communicate through the Preloader port rather than forcing BROM. Custom DA/Preloader Files
Now, we connect the dots.
For modern devices like newer Xiaomi, Oppo, or Samsung models, the eFuse completely shuts down unauthorized modification paths.
Imagine this: You’ve just tried to flash a custom recovery, unbrick your Android device, or bypass the factory reset protection. You connect your phone to the PC, load up the SP Flash Tool or Miracle Box, hit "Download," and instead of a success message, you are greeted with a cryptic red text:
This requires advanced micro-soldering skills. Incorrect shorting can permanently damage the CPU.
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. The error is a hardware-level security restriction found
: Many traditional bypass tools cannot re-enable BROM once this fuse is set, making standard "one-click" bypasses ineffective on newer security patches. Best Solutions and Workarounds
A few years ago, a major vulnerability was found in MediaTek chips. Tools could "crash" the BROM and gain full control of the device. This made it easy to bypass FRP (Factory Reset Protection) or flash custom software on almost any MediaTek phone. Phase 2: The Manufacturer Strike Back
: The term "best" here could imply that disabling BROM by efuse 0x146 results in an optimal or recommended configuration for the device, possibly enhancing security or performance, though it's context-dependent.
