Docomo — Unlock Bootloader Install

Disclaimer: The following text is for educational purposes only. Unlocking the bootloader on NTT Docomo devices carries significant risks, including voiding your warranty, potential data loss, and the chance of "bricking" (permanently damaging) your device. Proceed at your own risk.

Phase B: Obtain Unlock Key

1. Dial *#*#7378423#*#* → Service Info → Configuration → Check “Rooting Status. Bootloader unlock allowed: Yes”.
2. Note your IMEI (Dial *#06#).
3. Visit Sony Unlock Bootloader → Request key.

Recommendations

• For most users: Avoid unlocking unless you need custom ROM features; consider secondary device.
• For developers/enthusiasts: Use device-specific guides, start by unlocking a test device, and maintain backups.
• For docomo-specific devices: Confirm whether Docomo applied carrier locks or custom partitions; plan to reflash stock Docomo ROM if returning device for service.

Report: Unlocking the Bootloader and Installing Custom Firmware on Docomo Devices

4. Install ADB & Fastboot on Your PC

• Windows: Download Platform Tools from Google.
• Mac/Linux: Use Homebrew (brew install android-platform-tools) or package manager.