"BROM disabled by efuse 0x146" indicates a permanent hardware-level lockout on MediaTek (MTK) chipsets
For years, security researchers exploited the BROM download mode to bypass signature checks, unbrick devices, and gain low-level access. These exploits (e.g., mtk-su , brom-exploit , kamakiri , mt8163 BROM bugs) worked because the BROM would accept authenticated preloader from the host PC over USB.
"Formatting NAND will fix it." Fact: Formatting cannot change eFuse. The error occurs before any NAND access. brom disabled by efuse 0x146
Tools like , CM2MTK , or commercial boxes (Infinity CM2, Miracle Thunder) sometimes have built-in brute-force or authentication bypass scripts. These exploit known vulnerabilities in the BROM protocol before the eFuse check is fully enforced. For example, sending a specific sequence of USB commands might trick the BROM into thinking the debug fuse is still intact. However, modern chips have patched most of these exploits.
Programming eFuse 0x146 to disable BROM is a powerful security measure that prevents low-level access and enforces secure boot, but it is generally irreversible and eliminates common recovery channels. Engineers should treat its programming as a late-stage, controlled action and maintain documented, vendor-approved recovery and repair processes to avoid bricking devices in the field. "BROM disabled by efuse 0x146" indicates a permanent
How to confirm the cause (diagnosis steps)
(electronic fuses) are one-time programmable (OTP) memory cells embedded inside the SoC. Unlike flash memory, once an eFuse is "blown" (set from 0 to 1), it cannot be reversed. Manufacturers use eFuses to: The error occurs before any NAND access
(e.g., Amazon Fire 7 2019) – If that connects fine, but your Dimensity device shows 0x146, you’re fused.