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Converting files to a file is a common task for developers and hobbyists working with Spreadtrum (SPD) or Unisoc
mobile devices. This process, often called "packeting," bundles individual partition images into a single flashable firmware package. Core Tools Required To perform this conversion, you will typically need: SPD Research Tool (ResearchDownload) : The primary utility used to build and flash .pac files. SPD Drivers
: Essential for your PC to communicate with the mobile device during any testing. Firmware Partition Files
: Your collection of .bin or .img files (e.g., FDL1, FDL2, boot, recovery, system). Step-by-Step Conversion Process SPD Research Tool
, follow these steps to "packet" your bin files into a .pac format: Launch the Tool ResearchDownload.exe on your PC. Access Settings : Click the Gear (Settings) icon at the top left to open the Download Settings menu. Load Bootloader Files Double-click the row and browse to select your Do the same for Load Partition Images
For each remaining partition (system, recovery, boot, etc.), double-click the corresponding row under the "File Name" column and select the appropriate .bin or .img file.
: Ensure the checkboxes for all files you want to include are selected. Configure Options
: In the "Options" tab, it is often recommended to uncheck the "Partition" option unless you are specifically modifying the partition table. Create the Packet Return to the main screen and click the (or "Packet" icon) button. Product Alias (device model) and Product Version (build number) when prompted. Choose a save location and name your new file (e.g., firmware.pac
and wait for the tool to finish building the archive. A "Passed" or "Complete" message will appear when finished. Alternative: CM2 Firmware Converter If you have firmware backed up via Infinity CM2 (Chinese Miracle II) , it might be in a or proprietary FW Converter Convert Infinity PAC.SC to SPRD PAC
Select your source file and follow the prompts to save it as a standard .pac file. Key Considerations File Naming : While many files are .img, essential components like must remain in format for the tool to recognize them correctly. Chipset Compatibility
: Always use FDL files compatible with your device's specific chipset (e.g., SC9863A, Tiger T310) to avoid hardware damage. Do you need help extracting
an existing .pac file to modify its internal .bin files before rebuilding it?
Converting a firmware file into a format is essential for flashing Unisoc/Spreadtrum (SPD) devices using standard tools like SPD Upgrade Tool Research Download
. This process involves "packeting" multiple individual component files (like boot, system, and recovery) into a single flashable package. Prerequisites
Before you begin, ensure you have the following components ready: The Component Files: files (e.g., FDL1, FDL2, boot, system, recovery). SPD Research Download Tool: Download and extract the latest version of SPD Research Tool SPD USB Drivers: Install the SPD Drivers
on your PC to ensure your device is recognized during any later flashing steps. Step-by-Step: Converting BIN to PAC Launch the Research Download Tool Open the extracted folder and run ResearchDownload.exe as an administrator. Access Packeting Settings Click on the Settings (gear icon) at the top left to open the Download Settings menu. Load the FDL Files how to convert bin file to pac file hot
The FDL1 and FDL2 files are critical for communication between the tool and your device's chipset. Double-click the row under the "File Name" column, browse to your , and select it. Repeat the same for Load the Remaining Partitions
Continue loading other necessary files from your firmware folder. Standard partitions include: Browse and select recovery.img system.img
If a partition is not available, leave its box unchecked to skip it. Configure Packet Info Flash Operations
tab to verify that the "Partition" option is unchecked if you are just building the file. Create the PAC File Return to the main page and click the A prompt will appear asking for the Product Alias (mobile phone model) and Product Version (build number). Enter these details for reference. Select your desired save location and click Completion
The tool will begin building the file. Once the process is finished, a success message will appear, and your new file will be ready in the selected folder. Pro Tip: Using CM2 for Conversion If you are using the Infinity CM2 (Chinese Miracle 2) dongle, you can convert backups easily: Open the CM2 SPD module. FW Converter Convert Infinity PAC.SC to SPRD PAC
Select your backup file and choose a destination to save the converted
To convert a firmware file into a file for Spreadtrum/Unisoc devices, you generally need to use specialized mobile repair tools like Research Download Tool Infinity CM2 SPD
. This process involves "packing" individual partition images (which may be in format) into a single flashable package. Method 1: Using Research Download Tool This is the standard way to build a factory file if you have the individual firmware components. Prepare Files
: Ensure you have all necessary partition files (FDL1, FDL2, Boot, Recovery, System, etc.). Most should be in format, but some like the logo can be SPD Research Tool (ResearchDownload.exe). : Click the Settings (gear icon) . In the "Download Files" tab, double-click the slots to browse and select your specific FDL files. Add Other Partitions
: Load the remaining files (system, boot, etc.) into their respective slots by double-clicking under the "File Name" column and selecting your Configure Settings tab and uncheck the "Partition" option. Product Alias (phone model) and Product Version Pack the File : Click the
button. Choose your save location, name the file, and wait for the tool to finish building the Method 2: Using Infinity CM2 SPD (Converter Tool)
If you are using the Infinity box, there is a built-in conversion feature. Launch CM2 : Open the Infinity CM2 SPD Navigate to Converter : Go to the tab and select FW Converter Convert Infinity PAC.SC to SPRD PAC (or a similar option for files depending on your version). Select Source
: A window will pop up; browse to the folder containing your backup and select the source file. Save Output : Choose where you want to save the new file and click
. The tool will sign and pack the system files automatically. Key Considerations SPD Drivers : Ensure you have the correct SPD USB Drivers installed on your PC before starting. : You cannot build a file without the correct FDL1 and FDL2
files specific to your device's chipset, as these tell the tool how to communicate with the hardware. specific version Converting files to a file is a common
of the Research Download Tool is best for your particular phone's chipset? AI responses may include mistakes. Learn more
Note: In tech support circles, "hot" refers to a live, active conversion without system reboots or delays—often critical for proxy auto-config updates.
| Tool | Purpose | Link / Source |
|------|---------|----------------|
| binwalk | Analyze .bin structure | GitHub |
| Huawei PAC Maker | Create .PAC from extracted files | Router forums (use with caution) |
| Firmware Mod Kit | Unpack/repack firmware | GitHub |
| PAC Proxy Generator | Create .pac for proxy auto-config | Manual script writing |
gpupdate /force (if using WPAD) or toggle "Use automatic configuration script" off/on.sudo networksetup -setautoproxyurl "Wi-Fi" "http://server/proxy.pac"gsettings set org.gnome.system.proxy autoconfig-url "http://server/proxy.pac"Goal: Convert a settings .bin backup to a flashable .PAC file.
binwalk firmware.bin
dd if=firmware.bin of=rootfs.bin skip=XXX bs=1
If you tell me the device/chipset and what the BIN contains (single image vs multiple partitions), I can give precise commands and an example scatter file.
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To convert .bin files into a .pac file for Spreadtrum/Unisoc devices, you generally use the SPD Research Tool (also known as ResearchDownload). This process "packets" individual binary partition files (like boot.bin, system.bin, or recovery.bin) into a single flashable firmware archive. Essential Tools & Files
SPD Research Tool: The primary utility for building PAC files.
FDL1 and FDL2 Files: Critical bootloader binaries specific to your device's chipset.
BMAConfig.xml: A template file required by the tool to structure the PAC file correctly.
Partition Binaries: Your .bin or .img files for each partition (system, boot, recovery, etc.). Step-by-Step Conversion Process 1. Prepare the Environment
Download and install the SPD Drivers to ensure your PC communicates with the device.
Place the BMAConfig.xml file into the main folder of the Research Download tool as detailed by Hovatek. 2. Load the Binaries Launch the Research Download tool.
Click the Settings icon (gear icon) to enter the configuration menu.
Under the Flash Operations or Main tab, you will see a list of partitions (FDL1, FDL2, Boot, System, etc.). Windows : gpupdate /force (if using WPAD) or
Double-click the empty space under the File Name column for each entry to browse and select the corresponding .bin file.
Note: Ensure FDL1 and FDL2 are loaded first, as they are mandatory for the tool to function. 3. Build the PAC File
Go to the Options tab and uncheck Repartition if you want to preserve the existing partition table on the device. Click the Packet button.
A prompt will appear; click Yes to proceed with creating the package. Enter a Product Alias (phone model) and Product Version. Select your Saving Path and click OK.
The tool will begin "packeting." Once finished, you will see a "Packeting Complete" message.
💡 Pro Tip: If you are using a third-party box like Infinity CM2, you can use its built-in FW Converter to transform .pac.sc or other backup formats directly into a standard Spreadtrum .pac file. Helpful Resources
Hovatek Forum: Troubleshooting and community help for specific SP7731 chipset issues.
GitHub Spreadtrum Flash: A firmware dumper and utility for advanced users working with Unisoc chips.
Google Play - Bin File Opener: Useful for viewing or converting simple binary data on Android.
Hovatek Extract Guide: Instructions if you need to reverse the process and extract files from an existing PAC. If you Do you already have the FDL1 and FDL2 files?
Are you trying to fix a bricked phone or just create a firmware backup?
Here’s what most "how to convert bin file to pac file hot" tutorials won’t tell you:
system.bin) is larger than the space reserved in the PAC, flashing will fail or brick the device.Hot fix: Before repacking, use a tool like partition_size_changer.exe (risky, backup first) or trim your BIN to match the original partition size.
As of 2025, these are the most reliable techniques for converting BIN to PAC. They range from semi-automated tools to manual hex editing.
Not all BIN files are created equal.
🔥 Hot conversion reality check: If the BIN is encrypted or proprietary, your first step isn't conversion—it’s decryption or reverse-engineering.
