Cause: You flashed a generic G8141 FTF, not a hybrid.
Fix: Re-download a proper SO-33J base FTF. Open it with 7-Zip. You must see amss_fsg.sin and modem.sin. If missing, the lock file wasn't overwritten.
Word Count: ~1,500 | Difficulty: Advanced | Devices: Sony Xperia XZ Premium (Docomo SO-33J)
If you own a Sony SO-33J (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.
Most forums offer generic unlocking services or expensive code generators. But for the truly tech-savvy, there is a better way: Manual SIM lock removal via a modified FTF file.
This guide will walk you through why the standard methods fail, what an FTF file is, and how to use a custom FTF to liberate your SO-33J permanently.
Absolutely. For the Sony SO-33J, paying for a code is gambling. Docomo frequently changes their algorithm, rendering codes useless after an OTA update. The FTF method writes the unlock directly to the modem’s non-volatile memory. It persists through Android updates, factory resets, and even bootloader relocks.
The only downside? Requires a PC and 20 minutes of reading. But for a device as niche and powerful as the Xperia XZ Premium (4K HDR screen, SD835), it’s worth the effort. You turn a Japanese paperweight into a global beast.
Pro Tip: 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).
Need a visual guide? Search YouTube for "SO-33J Flashtool FTF unlock" – use this article as your textual companion.
The Sony Xperia X Performance (SOV33), the 2016 flagship released through au by KDDI in Japan, is a robust device featuring a Snapdragon 820 processor and a full metal body. If you are locked out of your device due to a forgotten pattern, PIN, or Google Account (FRP), using an FTF (Flash Tool File) is often a more effective and reliable solution than basic hard resets. Why FTF Flashing is Better for Lock Removal
Traditional hard resets via recovery mode can sometimes fail to clear deep security layers or may trigger Factory Reset Protection (FRP). Flashing a stock FTF firmware file is "better" because:
Total System Overwrite: It completely replaces the existing operating system, effectively wiping all security locks.
Fixes Software Corruption: It resolves issues like boot loops or "soft-bricked" states that a simple reset cannot fix.
Regional Flexibility: You can flash the specific Japan-market (au KDDI) firmware to ensure all carrier-specific features remain functional. Step-by-Step: Removing the Lock via FTF
To remove the lock on your SOV33, you will need a PC and the Sony Mobile Flasher (Flashtool). 1. Download Tools and Firmware sony sov33 lock remove ftf better
Flashtool: Download and install the latest version of the Sony Flashtool.
XperiFirm: Use this built-in tool within Flashtool to download the official SOV33 firmware. Look for the "au" (KDDI) Japan variant to match your device.
Drivers: Ensure the Xperia X Performance drivers are installed via the drivers folder in the Flashtool directory. 2. Prepare the FTF File
Once XperiFirm downloads the firmware, Flashtool will automatically begin decrypting and creating the bundle (the .ftf file).
The finished file is typically saved in C:\Users\YourName\.flashTool\firmwares. 3. Flashing the SOV33
Launch Flashtool and click the Lightning Bolt icon, then select Flashmode. Choose the SOV33 firmware you downloaded.
Crucial Step: In the "Wipe" section, ensure USERDATA and CACHE are checked. This is what removes the pattern/PIN lock. Click Flash.
Connect Device: Power off your SOV33. Hold the Volume Down button and connect the USB cable to the PC. The LED should turn green, indicating Flashmode.
Wait for the "Flashing finished" message. Disconnect and power on your phone. Alternative Official Method: Xperia Companion
If you prefer an official Sony tool, the Xperia Companion software offers a Software Repair feature. Pros: Safer and easier for non-technical users.
Cons: It requires you to know the original Google Account credentials if FRP is active. Summary Table: Lock Removal Methods Requirement Success Rate FTF Flashing Total lock removal & repairs PC, Flashtool, FTF file Xperia Companion Official software repair PC, Google Account info Hard Reset Quick data wipe Hardware buttons Low (FRP remains)
Note: All of these methods will erase all user data (photos, contacts, etc.) from the device. AU KDDI Sony SOV33 Xperia X Performance Japan ... - Kyoex
To remove the lock on a Sony SOV33 (Xperia X Performance) using FTF (Flash Tool Format) files, you typically need to flash a specific firmware or a specialized lock-removal script via the Sony Flash Tool (Flashtool). Core Method: Flashing FTF to Remove Lock
Flashing an FTF file is often considered "better" than a basic hard reset because it completely overwrites the system partitions, which can resolve persistent software locks or Factory Reset Protection (FRP).
Prepare the FTF File: You need the correct FTF firmware for the SOV33 model. Users often create or download specific "Lock Remove" FTF files that exclude the data wiping or include specific scripts to bypass the lock screen. Use Sony Flashtool: Download and install the Sony Flashtool on your PC. Place your FTF file in the C:/Flashtool/firmwares folder. Flash the Device: Cause: You flashed a generic G8141 FTF, not a hybrid
Open Flashtool and click the Lightning Bolt icon (Flashmode). Select the SOV33 FTF file.
To keep your data (if the FTF allows), uncheck the "USERDATA" wipe box; to remove the lock, ensure the "CACHE" and "APPSLOG" are selected for wiping.
Turn off your phone, hold Volume Down, and connect it to your PC. The tool will begin flashing once it detects the device. Alternatives for Lock Removal
If you don't have a specific FTF file, you can use these official Sony methods: Xperia Companion
: Use the "Software Repair" feature on the Sony Support site. This will factory reset the phone and remove the screen lock but will erase all data.
Google Find My Device: If the device is linked to a Google account and has internet, you can remotely erase it to remove the lock. Hard Reset (Manual): Turn off the device.
Press and hold Power + Volume Down until the recovery screen appears.
Select Factory Reset using the volume buttons and confirm with the Power button. Removing FRP Lock (Google Account Lock)
If the phone asks for a Google account after resetting (FRP), flashing a standard FTF might not be enough. You may need a specific FRP Bypass method for Android 7.0 or 8.0, often involving the TalkBack settings or specialized FRP bypass tools. If you'd like, let me know:
Are you stuck at the screen lock (PIN/Pattern) or the Google account lock (FRP)? Which Android version is currently on the device? Do you have the original Google account credentials?
I can provide specific steps for bypassing the FRP if you are locked out of the Google account. AI responses may include mistakes. Learn more
To remove the screen lock on a Sony Xperia X Performance (SOV33)
, using an FTF (Flash Tool File) is often more reliable than a simple hard reset because it completely overwrites the system partition where lock settings are stored. This process requires a computer and will erase all user data. Removing Screen Lock via FTF (Flashtool)
Prepare Tools: Download the latest version of the Sony Mobile Flasher (Flashtool) and the specific SOV33 FTF firmware file for your region.
Load Firmware: Open Flashtool, click the Lightning Bolt icon, select Flashmode, and navigate to the folder containing your SOV33 FTF file. Crucially: Under EXCLUDE
Configure Wipe: In the "Wipe" pane, ensure USERDATA and CACHE are checked. This is the step that effectively "removes" the lock by factory resetting the system. Enter Flash Mode: Power off your device completely.
Hold the Volume Down button while connecting it to your PC via USB. The LED should turn green, indicating it is in Flash Mode.
Flash: The tool will begin flashing the firmware. Once "Flashing finished" appears, disconnect and reboot your phone. Alternative: Sony Xperia Companion
If you don't want to manually handle FTF files, the official Xperia Companion tool is a safer "better" option for most users. Select Software Repair in the application.
Follow the on-screen prompts to put the device into flash mode (Volume Down + USB).
The software will automatically download and install the correct firmware, removing the lock in the process. Important Note on FRP
If a Google account was active on the device, you will encounter a Factory Reset Protection (FRP) lock after flashing. You must sign in with the original Google credentials to finish the setup. If you cannot access that account, you may need a separate FRP bypass method.
The Sony SOV33 features a Snapdragon 820 and a 5.2-inch 1080p display. By modern standards, it is slow and the battery life is poor.
However, for the niche community of Walkman enthusiasts (who want the LDAC Bluetooth codec) and compact phone lovers, the SOV33 is a treasure. The “FTF lock remove” method is better because it respects the device’s age—it’s free, it fixes the radio properly, and it requires no recurring subscription.
Final Advice: If you are new to flashing, pay for the tool. If you are a hobbyist with a steady hand for test points and a copy of Flashtool, the FTF method is the only way to truly liberate the SOV33 from its Japanese carrier grave.
Disclaimer: Modifying your device’s firmware voids warranties and carrier agreements. This article is for educational purposes. Always ensure you have the legal right to unlock your device based on local telecommunications laws.
Before you attempt the better lock removal, gather these:
Warning: Flashing the wrong FTF can hard brick your SO-33J. Do not flash G8141 FTF without stripping the partition loader (
boot_delivery.xml).
SIM_LOCK is NOT ticked (we want to overwrite it). Exclude BASEBAND only if you want to keep original radio – but for lock removal, do NOT exclude it.Wait 3–5 minutes. Flashtool will show: "Flashing finished. Please unplug and start your phone."