After installing stock ROM, dial:
*#*#7378423#*#* (Service Menu)
While custom ROMs like LineageOS offer newer Android versions (up to Android 10 or 11 via unofficial builds), they often break hardware features specific to the SO-01J. For example, the FeliCa chip (used for Japanese mobile payments like Osaifu-Keitai) only works on the stock Docomo ROM.
| Specification | Details |
|---------------|---------|
| Model | SO-01J |
| Base Global Model | Sony Xperia XZ (F8331/F8332) |
| Carrier | NTT Docomo, Japan |
| OS (Original) | Android 6.0.1 Marshmallow |
| Latest Official OS | Android 8.0 Oreo |
| Security Patch Level (Final) | ~2019 (varies by build) |
| Bootloader Status | Locked by Docomo (unlockable via official method with restrictions) |
| ROM Type | Stock / Carrier-branded |
Bootloader Status – Locked bootloader recommended for guaranteed OTA updates. Unlocked may still work but could break some carrier features.
Docomo Bloatware – Stock ROM includes Japanese carrier apps (dメニュー, dアカウント, etc.). These can be disabled, not easily removed without root.
Before discussing the ROM itself, it is crucial to understand the hardware. Globally, Sony released the Xperia XZ (F8331/F8332). However, in Japan, NTT Docomo released the SO-01J.
While the internals (Snapdragon 820, 3GB RAM, 5.2-inch 1080p display) are identical to the global variant, the modem, bootloader, and partition layout are distinctly different. The Docomo Japan firmware includes specific carrier aggregations (for LTE bands 1, 19, 21, and 28), Osifu-Keitai security protocols, and Japanese-exclusive features like POBox Plus (a Japanese input keyboard) and 1-Seg mobile TV support.
Consequently, you cannot flash a global F8331 ROM onto an SO-01J. Doing so will result in a hard brick. You must use the Official Sony Xperia XZ SO-01J -Docomo Japan- Stock Rom.
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