Note: This will factory reset your device and erase all data. 3. Installing Custom Recovery (TWRP) Procedure for Unlocking a SIM Lock | Support | NTT DOCOMO
This is a carrier-level restriction. Sony has confirmed that DOCOMO versions of Xperia devices are excluded from its official bootloader unlock program. For Samsung, Google Pixel, and other manufacturers, a DOCOMO-branded device almost always arrives with this flag set to "No," preventing any official unlocking method.
| Method | Risk Level | Success Rate (recent phones) | Notes | |--------|------------|------------------------------|-------| | (e.g., “unlock bootloader docomo” on eBay/random sites) | Very High | <5% | Often scams or they install malware. They may ask for TeamViewer access. | | Exploits like mtkclient (MediaTek) | Medium | Low | Only for older docomo phones with MediaTek chips (rare). | | Test-point / EDL flashes | High (brick risk) | Low | Requires disassembly, special cables, and compatible firehose files (rarely leaked for docomo). | | Sony’s official unlock (for Xperia) | Does NOT work | 0% | Sony’s site will reject IMEIs from docomo devices. | docomo unlock bootloader install
If you want, I can:
: Prevents the use of other carriers. Docomo allows official SIM unlocking for eligible devices through their official portal . Note: This will factory reset your device and erase all data
Open the phone dialer and enter *#*#7378423#*#* to access the service menu. Navigate to > Configuration > Rooting Status . Look for Bootloader unlock allowed :
You must verify if your specific handset can physically accept a bootloader unlock command. For Sony Xperia Devices Sony has confirmed that DOCOMO versions of Xperia
This method exploits a known vulnerability (CVE‑2021‑1931) in Qualcomm's Android Boot Loader (ABL) that affects the fastboot USB interface. It allows you to bypass the "Bootloader unlock allowed: NO" restriction entirely, even if the device is still SIM‑locked, because the exploit targets the fastboot command handler directly.
Open a Command Prompt or Terminal window inside your platform-tools folder. Verify connection by typing: fastboot devices Use code with caution.
Historically, Docomo requests manufacturers to hard-lock the bootloader. On many Sony Xperia models, for example, checking the service menu will show Bootloader unlock allowed: No .
