Asus Flash Tool is a free Windows utility for flashing stock firmware RAW files on Asus Zenfone, ROG Phone, ZenPad, and Padfone devices. Download all versions — restore stock ROM, unbrick any Asus phone, fix bootloop, and wipe data using Fastboot/CSC mode.
Asus Flash Tool — commonly abbreviated as AFT — is a free Windows application developed by ASUSTeK Computer Inc. for flashing official stock firmware onto Asus Android smartphones and tablets. It works with a wide range of Asus device families including Zenfone, ROG Phone, ZenPad, and Padfone series. It uses the firmware RAW ZIP file provided directly by Asus — do not extract the ZIP before loading it into the tool.
Asus Flash Tool works in Fastboot/CSC mode, which is a special low-level mode your Asus phone enters before Android loads. This gives the tool direct access to the device's storage, allowing it to write firmware even when the operating system is broken, corrupted, or completely unresponsive. It can recover phones stuck in a bootloop, on a logo screen, or that refuse to turn on — as long as the hardware itself is working.
There are two closely related tools worth knowing: Asus Flash Tool (AFT) supports most Asus phone models including some Zenfone and non-Zenfone devices. Asus Zenfone Flash Tool is focused entirely on the full Zenfone lineup and was created by a developer from the community. Both tools use Fastboot mode and accept the same firmware ZIP format.
The tool automatically detects the Asus device connected to your Windows PC, reads its serial number, and lets you select the correct firmware and wipe options. For downgrading firmware, you must enable the Wipe Data option. For regular firmware restore or upgrade, the wipe data option is your choice — though backing up data first is always recommended.
Full credit goes to ASUSTeK Computer Inc. for developing and distributing this tool.
All available versions of Asus Flash Tool (AFT) and Asus Zenfone Flash Tool for Windows. Use the latest version for best device compatibility. Always load the firmware as a ZIP — do not extract it before flashing.
Asus Flash Tool covers all major firmware tasks for Asus Zenfone, ROG Phone, ZenPad, and Padfone devices — from stock restore to full unbrick recovery.
Write the official Asus firmware back onto your device. Restores the factory software state after a failed OTA update, corrupted system, or any software-related issue. Use the correct firmware ZIP for your exact model code — never extract the archive.
How-To GuideRecover Asus devices stuck on a logo, looping at startup, or showing a blank screen. The tool operates in Fastboot/CSC mode — before Android loads — so it can write firmware even when the phone cannot boot into the operating system at all.
Unbrick StepsMove between firmware versions freely. Flash a newer build to get the latest features, or roll back to an older release when an update caused problems. Downgrading always requires enabling the Wipe Data option to complete successfully.
Flash GuideUse the Wipe Data option in Asus Flash Tool to perform a full factory reset alongside firmware flashing. This clears all user data, apps, accounts, and settings — returning the device to a completely clean state. Essential when downgrading.
See StepsAsus Zenfone Flash Tool includes options to reset Factory Reset Protection (FRP) and remove screen lock patterns or PINs during the flash process. This is especially useful when recovering a device you cannot access through the normal lock screen.
Learn MoreAsus Zenfone Flash Tool includes a built-in app backup feature. Before you flash, back up both user-installed and system apps to your PC as .ab files. This saves time reinstalling apps after the flash is complete, though app data is not included in the backup.
Backup GuideYou need three things before flashing: (1) the correct Asus stock firmware RAW ZIP file for your specific device model code, (2) the Asus USB driver installed on your Windows PC, and (3) Asus Flash Tool or Asus Zenfone Flash Tool extracted and ready to run. Some builds also require .NET Framework — install the latest version from Microsoft if the tool does not open. Make sure your PC has an active internet connection, as some AFT versions verify the device serial number online at startup.
AFT (the service version of Asus Flash Tool) follows nearly the same process but uses service/AFT-specific firmware ZIP files. Note that flashing AFT service firmware will lock the bootloader. If you need to root or unlock after flashing, you will need to go through the official Asus bootloader unlock process separately.
Asus Flash Tool is the most reliable firmware flashing utility for Asus Android devices — trusted by technicians, developers, and Asus users worldwide.
Asus Flash Tool and Asus Zenfone Flash Tool are both available at no cost. No license, no subscription, no account required. Download, install, and start flashing immediately on any Windows PC.
The tool automatically detects the Asus device connected to your PC via USB, reads its serial number, and identifies the hardware. No manual entry needed — just connect in Fastboot mode and the tool recognizes it.
Works with official Asus RAW firmware ZIP files — the exact format distributed by ASUSTeK. The firmware ZIP is loaded as-is without extraction, making the process simpler and reducing the chance of errors.
Choose whether to wipe user data during the flash. Keep data when doing a clean upgrade, or enable full wipe for downgrading or recovering a heavily corrupted device. The choice is yours with a single Yes/No option.
Supports a broad range of Asus phones and tablets — Zenfone 2, 3, 4, 5, 6, Zenfone Max, Zenfone Max Pro, ROG Phone series, ZenPad, Padfone, and many more models identified by their hardware code (X00TD, ZB601KL, ZE520KL, etc.).
Asus Zenfone Flash Tool includes built-in options to reset Factory Reset Protection (FRP) and clear screen locks during flashing. Useful for recovering devices where the normal lock screen cannot be bypassed through standard methods.
What is the difference between Asus Flash Tool and Asus Zenfone Flash Tool?
Asus Flash Tool (AFT) is a universal Asus flasher that covers most Asus phone models including some Zenfone and non-Zenfone models. Asus Zenfone Flash Tool supports the full Zenfone lineup only, but also adds extra features like app backup and FRP removal. If you have an Asus Zenfone, either tool will work — use whichever has the right firmware for your model.
What format does the firmware need to be in for Asus Flash Tool?
Asus Flash Tool uses official firmware RAW ZIP files from Asus. Do not unzip or extract the firmware before loading it into the tool — load the ZIP file directly. Extracting the archive first will cause the flash to fail or produce errors.
How do I enter Fastboot mode on an Asus phone?
Power off your Asus device fully first. Then press and hold the Power button and Volume Up button at the same time until the Fastboot screen appears on the display. The exact button combination can vary by model — if this does not work, check the XDA Developers forum for your specific device.
Why does Asus Flash Tool (AFT) require an internet connection?
AFT uses an internet connection to verify the serial number of the connected device during startup. This is a built-in check in the service version of the tool. Without internet access, AFT will not launch or run. Make sure your PC is online before opening the tool.
Do I have to enable Wipe Data when flashing?
No — Wipe Data is optional for regular firmware upgrades. However, when downgrading to an older firmware version, enabling Wipe Data is mandatory. If you skip it during a downgrade, the flash will likely fail. Always back up your data regardless of which option you choose.
Will flashing with Asus Flash Tool lock my bootloader?
Flashing official service/AFT firmware does lock the bootloader. If you need an unlocked bootloader for rooting or custom ROMs after flashing, you will need to unlock it again using the official Asus bootloader unlock tool from the Asus support website.
Does Asus Flash Tool work on Windows 11?
Yes. Asus Flash Tool and Asus Zenfone Flash Tool are compatible with Windows XP, 7, 8, 8.1, 10, and Windows 11 in both 32-bit and 64-bit versions. If the tool does not launch on Windows 10 or 11, make sure you have the latest .NET Framework installed.
Who made Asus Flash Tool?
Asus Flash Tool (AFT) was created by ASUSTeK Computer Inc. Asus Zenfone Flash Tool was developed by Pawneshwer Gupta (xdablogs). FlashTool.org provides an organized download hub and guides — full credit goes to the original developers.
Asus Flash Tool is for Asus devices only. Use these tools for other Android brands and chipsets.