Are you trying to unlock a model from Docomo?
If your device shows "Yes," follow the universal Android unlocking process: docomo unlock bootloader top
Further practical next steps (succinct)
Unlocking the bootloader on devices is notoriously difficult because the carrier typically disables this feature in the firmware to maintain system integrity and security. This write-up covers the standard verification steps, the difference between SIM and bootloader unlocking, and why "official" bootloader unlocking is often restricted on Docomo variants. ⚡ Essential Distinctions Are you trying to unlock a model from Docomo