Connect your Docomo device to the PC using a high-quality USB data cable.
In recovery, tap Install , select your Custom ROM zip file, and swipe to confirm flashing.
Here’s a short informational piece tailored for someone searching — typically a user with a Japan-market docomo Android device (e.g., Sony Xperia, Samsung Galaxy, or other carriers’ locked models). docomo unlock bootloader install
Extract the ZIP folder to an easily accessible directory (e.g., C:\platform-tools ).
Before attempting any software modifications, you must check if your specific device is even eligible for an unlock. Most Docomo-branded Sony Xperia models, for instance, are hardcoded with a restriction that prevents bootloader unlocking regardless of whether you have an official code. Open your device's dialer. Enter the code: *#*#7378423#*#* . Navigate to Service info > Configuration > Rooting Status . Look for Bootloader unlock allowed . Yes: You can proceed with standard unlocking steps. No: The bootloader is permanently locked by the carrier. Standard Unlocking Procedure (If "Yes") Connect your Docomo device to the PC using
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.
After booting into TWRP:
Type the following command to ensure your PC recognizes the device: adb devices Use code with caution. Copied to clipboard
With those details, I can provide the exact file downloads and command paths for your specific setup. Share public link Extract the ZIP folder to an easily accessible directory (e
Unlocking the bootloader (factory reset). Copy photos, contacts, and documents to a PC or cloud storage.
