If you own a (the Japan-exclusive NTT Docomo variant of the Xperia XZ Premium), you know the pain. You bought it cheap online, only to find it screaming “SIM locked” or “Enter Network Restriction Code” when you insert your local carrier’s SIM card.
Word Count: ~1,500 | Difficulty: Advanced | Devices: Sony Xperia XZ Premium (Docomo SO-33J)
Most forums offer generic unlocking services or expensive code generators. But for the truly tech-savvy, there is a way: Manual SIM lock removal via a modified FTF file.
Once the lock is removed via FTF, flash a generic US or Customized EU firmware without the baseband. You’ll get faster Android updates while keeping the radio unlocked. Disclaimer: Modifying your device’s radio firmware may violate local telecommunications laws. This guide is for educational purposes. The author is not responsible for bricked devices or voided warranties (though your SO-33J likely has none left).
