If your SOV33 runs Android 9 or 10, you must downgrade to Android 8 Oreo (build 47.1.F.1.105). Flash a stock SOV33 FTF using FlashTool in "Flashmode" (Volume Down while connecting USB). Use the "Exclude TA" option to preserve your DRM keys.
Before starting, ensure you have:
This process has three major phases: (1) Bootloader unlocking, (2) FTF preparation (the “top” part), and (3) Flashing & partition rewrite.
If you are reading this, you are likely holding a Sony Xperia device model SOV33 (often known as the Xperia XZs variant for the Japanese carrier au/KDDI) that is locked. Whether it is a SIM network lock, a Google FRP (Factory Reset Protection) lock, or you are just looking to debloat the heavy carrier firmware, finding the right file can be a nightmare.
In the Sony modding community, the term "Top FTF" often circulates as a holy grail—a clean, generic firmware file that can overwrite carrier restrictions.
In this detailed blog post, we will walk through the reality of removing the lock on a Sony SOV33 using FTF files, the tools you need, and the specific steps to flash the "Top" firmware safely.
The tool will now write the FTF content
The Sony SOV33, primarily known as the Xperia X Performance (AU KDDI), is a flagship device from Sony's 2016 lineup. While it remains a capable smartphone, many users face the challenge of a forgotten screen lock or being stuck at a Google Account (FRP) verification screen.
One of the most effective professional methods to regain access is by flashing a specialized FTF (Flash Tool Firmware) "Lock Remove" file. Understanding the FTF "Lock Remove" File
Unlike standard firmware which reinstalls the entire operating system, a dedicated SOV33 Lock Remove FTF is often a significantly smaller file (roughly 100MB) designed specifically to target and wipe the userdata partition or the security layer of the device.
SOV33-39.2.C.0.311-Remove-Lock.ftf: A common version used for the AU KDDI variant.
SOV33-35.0.D.0.362-Remove-Lock.ftf: Compatible with older Android builds. Prerequisites for Lock Removal Before starting, ensure you have the following: A PC with the latest Sony Xperia Flash Tool installed.
Correct Drivers: You must install the Fastboot and Flashmode drivers, typically found in the "drivers" folder of the Flash Tool installation directory. sony sov33 lock remove ftf top
Battery Life: Ensure your SOV33 has at least 50% charge to prevent shutdown during the process.
USB Cable: A high-quality micro-USB cable for a stable connection. Step-by-Step Guide to Removing the Lock AU KDDI Sony SOV33 Xperia X Performance Japan ... - Kyoex
Removing a lock from a Sony Xperia X Performance (SOV33) using FTF (Flash Tool File) firmware is a technical process typically used to bypass forgotten screen locks (Pattern, PIN, or Password) or to resolve software issues. Using Sony Mobile Flasher (Flashtool) to flash a stock FTF file effectively performs a factory reset, erasing all user data but also removing any existing screen locks. Essential Requirements for FTF Flashing
Before attempting to remove the lock via FTF, ensure you have the following:
Flashtool Software: Download and install the latest version of Flashtool on your PC.
SOV33 FTF Firmware: Use the "XperiFirm" button within Flashtool to download the specific stock firmware for the Sony SOV33 If your SOV33 runs Android 9 or 10,
Sony Mobile Drivers: Install the drivers from the Flashtool installation folder (usually C:\Flashtool\drivers) so your PC recognizes the device in Flash Mode.
Battery Charge: Ensure the device has at least 50% battery to prevent a shutdown during the process. Step-by-Step Lock Removal Process
Prepare the Firmware: Move the downloaded .ftf file into the firmware folder of your Flashtool installation. Launch Flashtool
: Open the application and click the Lightning Bolt icon, then select Flashmode. Select Firmware: Choose the
model and firmware version. In the Wipe pane, ensure USERDATA, CACHE, and APPS_LOG are checked to ensure the lock is removed. Connect in Flash Mode : Turn off your completely. Press and hold the Volume Down button.
While holding the button, connect the phone to your PC via USB. Phone battery > 50%
The LED on the phone should turn Green, indicating Flash Mode.
Start Flashing: Flashtool will begin writing the firmware to your device. Once the log shows "Flashing finished," disconnect the phone and power it on. Addressing FRP (Google Account Lock)