For collectors restoring an Xperia XZ to "factory fresh" condition, the Stock ROM is the only way to experience the device as it was intended by the Japanese engineers who built it. It preserves the correct calibration for the display (Sony’s creative look) and ensures the camera algorithms function as originally designed.
| Feature | SO-01J (Docomo) | Global F8331 | | :--- | :--- | :--- | | | SO-01J | F8331 / F8332 | | Bootloader Unlock | Officially NOT allowed (Docomo policy) | Allowed (via Sony site) | | Firmware Features | Osaifu-Keitai (Felica), Docomo bloatware | Sony AOSP/stock features | | Latest Android | Android 8.0 (Oreo) | Android 8.0 (Oreo) | | Baseband/Modem | Japan-specific LTE bands | International bands | Official Sony Xperia XZ SO-01J -Docomo Japan- Stock Rom
Even years later, the Stock ROM maintains a level of polish that many users find runs "smoother and cooler" than the final global updates. Specification Qualcomm Snapdragon 820 5.2-inch TRILUMINOS Full HD (1080 x 1920) 23MP Rear with Triple Image Sensing (Laser AF, RGBC-IR) RAM/Storage 3GB RAM / 32GB ROM (expandable via microSD) Durability IP65/68 Water and Dust resistance A Collector's Note Sony Xperia XZ SO-01J technical specifications For collectors restoring an Xperia XZ to "factory