I can give you the exact steps or exploits available for that specific hardware.
remains restricted on most Docomo variants of brands like Sony Xperia or Sharp. Service Review: Docomo Bootloader Unlocking Official Access : Docomo does docomo unlock bootloader top
As of late 2024, Docomo has started pushing on Android 14+ devices. Even if you unlock the bootloader, the phone may refuse to boot custom kernels. The "top" method now involves patching the boot image with Magisk before unlocking. I can give you the exact steps or