By Daniel Cross — Android Firmware Specialist | Updated April 2025

What Is LG Flash Tool?

LG Flash Tool is a free Windows utility for flashing stock KDZ and TOT firmware files onto LG Android smartphones. It is used to unbrick devices, downgrade firmware, and restore factory software. Compatible with all LG models from 2013 to 2021 and works on Windows 7 through Windows 11.

LG Flash Tool is the official firmware flashing utility developed for LG Android smartphones and tablets. It allows you to flash stock KDZ and TOT firmware files directly onto your LG device using a Windows PC. Whether you need to unbrick a non-booting device, downgrade to a previous firmware version, restore factory software after a failed root, or install a clean stock ROM, LG Flash Tool is the go-to solution for LG device owners and developers worldwide.

The tool has been the standard flashing solution for LG devices since 2013 and remains the most reliable way to manage LG firmware. Unlike third-party utilities, LG Flash Tool is designed specifically for LG's KDZ firmware format, ensuring compatibility and reliability across the full range of LG Android hardware.

For newer LG models (G6, V30, and beyond), LG released a companion tool called LGUP Tool, which handles TOT firmware files. Both tools are available free from this site and are fully supported on Windows 10 and Windows 11.

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Download LG Flash Tool

LG Flash Tool is the only ROM flashing utility specially designed for LG Android smartphones and devices. The latest version works with KDZ files larger than 1GB. Download the right tool for your device below.

LG Flash Tool 2.0.2.5 (Latest)

Windows 10 / 11

Download

LGUP Tool

For newer LG phones — Windows 10 / 11

Download

LG USB Driver

Required — All Windows versions

Get Driver

Requirements Before You Flash

A Windows computer (Windows 7, 8, 10, or 11) to run the application.
LG USB drivers installed on your PC before connecting the device.
The correct KDZ firmware file for your exact LG device model and region.
The Megalock.dll file placed in the LG Flash Tool installation directory (for some versions).
A working USB data cable compatible with your LG smartphone.
At least 70% battery charge on your LG device before starting.

Important: Copy the downloaded KDZ file into the extracted folder of the tool before starting, or save it in an easily accessible location such as the desktop. The tool needs to locate the firmware file to begin the flash process.

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Compatible LG Devices

LG Flash Tool supports the full range of LG Android smartphones and tablets, including devices with the following chipsets:

Chipset / Platform	Firmware Format	Recommended Tool
Qualcomm Snapdragon (2013–2016)	KDZ	LG Flash Tool
Qualcomm Snapdragon (2017+)	TOT / KDZ	LGUP Tool
MediaTek (IM, BIN)	KDZ / BIN	LG Flash Tool
CDMA Smartphones	KDZ	LG Flash Tool
Infineon	KDZ	LG Flash Tool
LG G2, G3, G4, G5	KDZ	LG Flash Tool
LG G6, V20, V30, G7, V40	TOT	LGUP Tool
LG K-series, Q-series, X-series	KDZ / TOT	LG Flash Tool or LGUP

Not sure which tool to use? If your device was released before 2017, use LG Flash Tool with a KDZ file. If your device is from 2017 or later, use LGUP Tool with a TOT file. Still unsure? Check our troubleshooting page for model-specific guidance.

Troubleshooting Tips

If you experience problems running LG Flash Tool, the following fixes resolve the most common issues. For a full troubleshooting reference, visit our dedicated troubleshooting guide.

If the tool fails to launch, install the Visual C++ runtime library from Microsoft and try again.
If the tool reports that the phone is disconnected, disconnect from USB 3.0 and reconnect to a USB 2.0 port.
If the application does not perform correctly, verify that the downloaded LG Flash Tool version is compatible with your device model.
Enable USB debugging in Developer Options before booting into download mode.
Ensure the KDZ file you downloaded matches your device's exact build number and region code.
For LGUP users: install LGUP_8994_DLL_Ver_0_0_3_23 first, then install LGUP_Install_Ver_1_14_3 to avoid tool misbehavior.
If LGUP shows "Unknown Device", remove and reinsert the battery (where applicable) rather than using the power button.
Select "Normal Flash" to replace firmware without losing data, or "CSE Flash" to wipe and restore only boot files.

Frequently Asked Questions

What is LG Flash Tool used for?

It flashes stock KDZ and TOT firmware files onto LG Android smartphones, useful for unbricking, downgrading, or restoring factory firmware. It is also used to recover devices stuck in bootloops or those that fail to start after a failed software modification.

Is LG Flash Tool free?

Yes, completely free. No registration or payment is required at any step. Any site asking you to pay or register to download LG Flash Tool is not a legitimate source.

Do I need LG USB drivers?

Yes — install LG USB drivers before connecting your phone or using the flash tool. Without the correct drivers, Windows will not recognize your LG device in download mode. See our USB Driver page for the latest drivers.

What's the difference between LG Flash Tool and LGUP?

LG Flash Tool handles KDZ files for older devices (2013–2017). LGUP handles TOT files for newer devices (2017+). Most users working with LG V20, G6, V30, or newer models should use LGUP Tool. For older models like G3, G4, and G5, LG Flash Tool is the right choice.

Does it work on Windows 11?

Yes. Both LG Flash Tool 2.0.2.5 and LGUP work on Windows 10 and 11 with LG USB drivers installed. Run the tool as Administrator on Windows 11 if it does not launch automatically.