NTT Docomo specifically requests manufacturers to disable the bootloader unlock toggle ( OEM Unlocking ) in developer settings. Even if the toggle is visible, the underlying "Allowed" status in the service menu often remains "No".
Unlike global versions, Japanese carrier models from Docomo, Softbank, and Au are notoriously "hard locked". The standard "OEM Unlocking" toggle in Developer Options is either missing or greyed out, and the official Sony Bootloader Unlock website won't provide a code for his IMEI. The Quest for a Workaround
For devices requiring unlock codes (such as Motorola or HTC): First retrieve the identifier token: docomo unlock bootloader install
If it says Bootloader unlock allowed: No , standard fastboot commands will fail. You must use paid exploit software or server tokens to force an unlock. For Google Pixel Devices
Tools such as "qUnlock tool" can forcibly disable bootloader restrictions on Docomo Xperia devices. These typically cost money and require registration. The process involves purchasing the tool, receiving login credentials via email, connecting the phone in Fastboot mode, and running the provided software to override the restriction. The standard "OEM Unlocking" toggle in Developer Options
If you are working on a Docomo Google Pixel, or if you have successfully converted your device firmware to a global variant, use the standard Fastboot protocol.
Ensure your phone is charged to at least 70%. For Google Pixel Devices Tools such as "qUnlock
With your custom recovery running, you are ready to replace Docomo's stock system with a clean, high-performance custom ROM. Preparing the Files
It is vital to distinguish between these two different types of locks: