The following official stock ROM builds are known for the SO‑01J:
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Download the Xperia Companion (official) or Xperia Flash Tool (third-party) to perform the installation. Charge the Device: Ensure at least 60% battery power. Download Official Sony Xperia XZ SO-01J Stock Rom
SO-01J_39.2.B.0.336_1305-9077_R15C (Android 8.0 Oreo). Official Sony Xperia XZ SO-01J -Docomo Japan- Stock Rom
The Sony Xperia XZ SO-01J Stock ROM is a time capsule. It represents an era where Japanese carriers ruled the smartphone experience with an iron fist, layering their services onto top-tier hardware. It is a ROM defined by compromise: trading raw speed for deep local integration, and trading stock Android purity for carrier-specific utility.
Ensure your Xperia XZ has at least 50% battery capacity to prevent it from shutting down mid-flash.
Usually, Android 6.0 Marshmallow or later updates (up to Android 8.0 Oreo), tailored for Japan. The following official stock ROM builds are known
: It introduced the "Loop Surface" design with a body made of
Extract the newflasher.exe into the folder containing the downloaded .sin and .elf files. Step 2: Connect the Phone Turn off your Xperia XZ (SO-01J).
The stock ROM for the SO-01J variant is tailored to the specific hardware and carrier requirements of NTT Docomo in Japan. NTT Docomo (Japan). Model Number: Launched with Android 6.0.1 (Marshmallow) , with official updates reaching up to Android 8.0 (Oreo) File Format: Typically distributed as an file for use with Sony flashing tools. Regional Features: Can’t copy the link right now
If you are trying to resolve a specific issue on your device, tell me:
The LED light should turn , indicating it is in flash mode. Step 3: Run Newflasher Double-click newflasher.exe .
| Problem | Possible Cause | Solution | |:---|:---|:---| | | Wrong firmware (e.g., F8331 on SO-01J) | Download correct SO-01J Docomo firmware. | | Device won’t enter Flashmode | Driver not installed / USB cable faulty | Reinstall Sony USB drivers; use original cable. | | Bootloop after flashing | Incomplete flash or incompatible version | Re‑flash the correct firmware using Flashmode. | | Stuck at Sony logo | Data corruption | Perform a factory reset from recovery. | | Update not found via OTA | Docomo servers no longer host updates | Use Xperia Companion (it checks Sony’s servers). | | “Bootloader unlock allowed: No” | Carrier‑locked / unsupported device | Cannot unlock officially; use paid service (not recommended). |