Before beginning, you must ensure you have the following:
Incorrectly executing unlock procedures—especially with unofficial exploits or paid tools—can result in a "bricked" device that is unusable. This risk is amplified with Docomo phones because most official unlocking methods do not apply, forcing users to rely on experimental exploits.
Go to Settings > About Phone and tap Build Number 7 times.
fastboot oem get_identifier_token
You will hard-brick the phone – no recovery, no download mode – because docomo phones have signature verification on boot images. docomo unlock bootloader install
From the recovery menu, you can now wipe the system and flash your custom ROM .zip file (like LineageOS) directly from an SD card or via adb sideload .
As of 2025, Docomo has relaxed some restrictions on recent models, but older devices (pre-2021) are notoriously difficult.
Before downloading any files, you must understand that NTT Docomo handles device security differently than standard international variants.
If it says Bootloader unlock allowed: Yes , you can use official fastboot methods. Before beginning, you must ensure you have the
Open Command Prompt or Terminal on your PC.
NTT Docomo is one of Japan’s largest carriers. Historically, Japanese carrier-branded smartphones (like the Galaxy, Xperia, or Sharp Aquos series sold by Docomo) come with a locked bootloader, preventing users from installing custom recoveries, rooting the device, or flashing custom ROMs.
Websites like UnlockBase or NTT Docomo Bootloader Unlock Service (paid, $15–$30 USD) remotely unlock by sending modified firmware files.
Locate . If it is greyed out, connect your phone to Wi-Fi, ensure your Docomo contract/payment obligations are clear, and check again. If it remains greyed out, the device bootloader cannot be officially unlocked. 4. Step 2: Unlocking the Bootloader Method A: The Fastboot Method (Pixels and Eligible Xperias) Turn off your device completely. Boot into Bootloader/Fastboot mode: Pixels: Press and hold Volume Down + Power . Before downloading any files, you must understand that
Check if the "OEM Unlocking" capability shifts to available. Method B: Specialized Third-Party Software Exploits
An original or high-quality OEM USB data cable (USB 2.0 ports are often more stable than USB 3.0 for fastboot commands).
Disclaimer: This article is for educational purposes. Unlocking your bootloader may violate your carrier agreement. The author is not responsible for bricked devices or data loss.
In Developer Options, look for “OEM Unlocking” or “Allow bootloader unlocking” . If it’s grayed out or missing, your device is likely locked by Docomo policy.
If you found an online guide claiming to unlock your specific docomo model, share the model number in a reply, and I can check if it’s a known fake or a rare exception.
Unlocking the bootloader will wipe all data on your device (Factory Reset). Back up everything.