SPD Flash Tool (SPD Upgrade Tool)
Free Download – All Versions for Windows

SPD Flash Tool — also widely known as SPD Upgrade Tool or Spreadtrum Flash Tool — is a free Windows application developed and officially distributed by Unisoc Communications Inc. (formerly Spreadtrum Communications). It is designed to flash, reinstall, or repair .pac firmware on Android smartphones, tablets, and feature phones that run on Spreadtrum (SPD) or Unisoc chipsets. SPD Flash Tool does not work with MediaTek (MTK), Qualcomm (Snapdragon), or Samsung Exynos devices — each of those requires a different flashing tool.

The tool works by reading a .pac firmware file, which packages all the device partitions — bootloader, system, recovery, and more — into a single bundle. SPD Flash Tool then writes this package to the device over a USB connection. Because the tool communicates directly with the Spreadtrum/Unisoc hardware before Android starts, it can recover phones that are completely stuck, won't boot, or show a blank screen.

There are three official variants of the SPD Flash Tool suite: the standard SPD Upgrade Tool (runs via UpgradeDownload.exe), the more feature-rich SPD Research Tool, and the production-line focused SPD Factory Tool. All three flash .pac firmware and share a similar interface. For most users and repair technicians, the SPD Upgrade Tool is the go-to choice.

SPD Flash Tool is a portable application — no installation needed. Download the ZIP, extract it, and run the executable directly. Full credit goes to Unisoc Communications Inc., who creates and releases this software. FlashTool.org provides a free, organized download hub for all versions alongside setup guides and driver resources.

Before You Start – Requirements

You need three things before flashing: (1) the correct .pac firmware file for your exact Spreadtrum or Unisoc device model, (2) the Spreadtrum USB driver (SPD Driver) installed on your Windows PC, and (3) a working USB data cable. Without the SPD driver, the tool will not detect your device.

Step-by-Step: Flash .pac Firmware with SPD Upgrade Tool

1. Install the Spreadtrum USB driver — Download and install the SPD USB-driver on your Windows PC. Restart the PC after installation if prompted.
2. Download and extract SPD Upgrade Tool — Get the correct version from the download table above and extract the ZIP to a folder. No installation needed.
3. Open UpgradeDownload.exe — Inside the extracted folder, double-click UpgradeDownload.exe to launch SPD Upgrade Tool directly.
4. Load the .pac firmware — Click the Load Packet button (or the folder icon). Navigate to your firmware folder and select the .pac file. The tool will read and display the firmware partitions.
5. Power off your device completely — Make sure the phone or tablet is fully powered off before connecting. Do not boot into Android.
6. Click Start Downloading — Press the Start Downloading button in SPD Upgrade Tool. Then immediately connect your powered-off device to the PC via USB. The tool will detect it automatically and begin flashing.
7. Wait for the green Passed message — Flashing usually takes two to five minutes. When done, a green Passed message appears. Disconnect the device and power it on normally.

SPD Research Tool – Alternative Method

If the standard SPD Upgrade Tool does not work for your device or firmware, try SPD Research Tool. It has a more detailed interface and is often more reliable for newer Unisoc chipsets. The process is the same — launch the tool, load the .pac file, connect the powered-off device, and start flashing.

What is the difference between SPD Upgrade Tool, Research Tool, and Factory Tool?
All three tools flash .pac firmware on Spreadtrum/Unisoc devices and share a very similar interface — they are just different variants of the same SPD flashing platform. SPD Upgrade Tool is the standard version for most users. SPD Research Tool has more advanced features and is often more reliable for newer chipsets. SPD Factory Tool is designed for OEM production lines. Any of the three will work for everyday flashing tasks.

What causes Bin Packet Load Error in SPD Upgrade Tool?
Bin Packet Load Error appears when the .pac firmware you are trying to load is not compatible with the version of SPD Upgrade Tool you are using. The solution is to try a different (usually older) version of the tool that matches when your firmware was released. Check the version history table on this page.

Does SPD Flash Tool work on Windows 10 and Windows 11?
Yes. SPD Upgrade Tool is compatible with Windows XP, Vista, 7, 8, 8.1, 10, and Windows 11 — both 32-bit and 64-bit editions. No special compatibility settings are needed on modern Windows versions.

Do I need to install a driver before using SPD Flash Tool?
Yes — you must install the Spreadtrum USB driver (SPD Driver) on your PC before connecting the device. Without the driver, SPD Upgrade Tool will time out and fail to detect the phone. Install the driver first, then launch the tool.

Does SPD Flash Tool work on Qualcomm or MediaTek phones?
No. SPD Flash Tool only supports Spreadtrum and Unisoc chipsets. For MediaTek devices use SP Flash Tool. For Qualcomm devices use QPST Flash Tool. For Samsung Exynos use Odin Flash Tool.

Will flashing with SPD Upgrade Tool erase my data?
Yes — flashing .pac firmware with SPD Upgrade Tool wipes all personal data from the device, including contacts, apps, photos, and messages. There is no partial flash option like SP Flash Tool's Download Only mode. Always back up everything before you start.

Does SPD Flash Tool need an internet connection?
No. Once downloaded and extracted, SPD Upgrade Tool runs completely offline. You only need an internet connection to download the tool and your .pac firmware file beforehand.

Is SPD Flash Tool safe for my PC?
Yes. SPD Upgrade Tool is an official tool released by Unisoc Communications Inc. It does not install anything on your PC, does not modify system files, and does not require any account. It is widely used by repair technicians and OEM engineers worldwide.

Who made SPD Flash Tool?
SPD Flash Tool (SPD Upgrade Tool) is created and officially distributed by Unisoc Communications Inc. (formerly Spreadtrum Communications). FlashTool.org organizes all versions with guides and driver resources — full credit goes to Unisoc Communications Inc.