This is a popular method for Sony Xperia users, though it yields mixed results regarding the actual bootloader status.
Flashing the firmware of an identical global hardware model onto the Docomo device using tools like XperiFirm and Flashtool. docomo unlock bootloader top
Older flagships vulnerable to EDL (Emergency Download Mode) leaks can sometimes be flashed with modified firehose programmers to remove lock flags. 3. Cross-Flashing Global Firmware This is a popular method for Sony Xperia
The mtk-su exploit allows temporary root access on many MediaTek-powered Docomo phones, sometimes allowing a bootloader bypass. docomo unlock bootloader top
NTT Docomo is Japan's largest mobile service provider. Unlike global variants of popular phones from Sony, Samsung, and Sharp, Docomo requests manufacturers to hard-lock the bootloader. Why Docomo Locks Devices