Since docomo blocks official unlocking, users often turn to remote services like qUnlockTool or similar providers.
Run the tool's unlock procedure. The tool writes payload data to the device's security partition to alter the bootloader flag.
Download the official package.
On Sony devices, unlocking the bootloader wipes the TA partition (Trim Area), deleting DRM keys. This results in the loss of:
After unlocking the bootloader, you can install a custom recovery like TWRP (Team Win Recovery Project). Here's how: docomo unlock bootloader install
On specific Sony platforms (Yoshino and Tama chipsets), a Fastboot USB interface vulnerability (CVE-2021-1931) allows bootloader unlocking even when allowed shows "NO." This exploit works on Xperia XZ1, XZ1 Compact, XZ2, and XZ2 Compact models, which use Snapdragon 835 or 845 processors. The exploit works by exploiting a buffer overflow vulnerability in the Fastboot interface, bypassing all official restrictions. However, even after unlocking via this exploit, DRM features will not work with an unlocked bootloader state, though the device key is not erased from TA as it would be with official unlocking. It is essential to backup TA even when using this exploit.
If purchased outright or fully paid off, the "OEM Unlocking" toggle in Developer Options can usually be enabled once the device connects to the internet. You can then use standard Google fastboot commands. Sony Xperia (Docomo SO-xx Models) Since docomo blocks official unlocking, users often turn
Type fastboot devices to ensure your phone is detected.
If your specific model is confirmed to support bootloader unlocking (or you are using a third-party exploit tool), you must prepare your computer environment. Prepare Your Computer Download the official package