With an unlocked bootloader and custom recovery installed, you are ready to flash a clean, stock-Android-based ROM like LineageOS or Pixel Experience. Step-by-Step Installation Process
Download a custom recovery (like TWRP or OrangeFox) matching your Docomo model number (Docomo hardware often differs slightly from global variants!). Reboot to bootloader mode again: adb reboot bootloader Use code with caution. Copied to clipboard Flash the recovery image file: fastboot flash recovery recovery_name.img Use code with caution. Copied to clipboard
Select Reboot System . The first boot can take up to 5–10 minutes. 7. Crucial Post-Installation Pitfalls for Japanese Devices docomo unlock bootloader install
Tap seven times until "Developer Options" is enabled. Go back to Settings > System > Developer Options . Enable USB Debugging .
If your phone states "Bootloader unlock allowed: No," you cannot use fastboot commands. You must: With an unlocked bootloader and custom recovery installed,
Before proceeding, confirm your model:
python mtk wl python mtk da seccfg unlock Copied to clipboard Flash the recovery image file:
Some custom ROMs require specific flashing patches or IMS registration edits to enable Voice over LTE (VoLTE) calling on the Docomo network. Check your ROM’s specific device thread for a VoLTE patch if your calls fail to connect.
As mentioned above, unlocking the bootloader on a Sony Xperia device triggers a hardware‑level fuse that permanently deletes the TA partition's DRM keys. Without a pre‑unlock backup, your camera will never perform as well again — low‑light photos will become noisy, and features like X‑Reality for video may stop working.
Not all Docomo phones can be unlocked. Docomo and manufacturers allow unlocking only on specific models.