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Information regarding the Huawei E5573s-320 and its usbloader.bin file is primarily documented in technical community forums and firmware recovery guides rather than academic papers. This file is a critical emergency bootloader utility used for unbricking, unlocking, or debranding the device. Role of usbloader.bin
The usbloader.bin acts as an external bootloader that is loaded into the modem's RAM when the device is in an emergency state (often called "Download Mode" or "3G PC UI Interface" mode).
Emergency Recovery: It is used when the firmware is corrupted and the modem cannot boot normally.
Flash Access: Once loaded, it enables the modem to accept new firmware images (BIN or EXE) via tools like the Balong USB Downloader.
Data Risks: Standard usbloader.bin files from Huawei can erase NAND flash memory, potentially wiping unique factory data like IMEI and Serial Numbers. Modified "safe" versions, often named usblsafe.bin, are preferred by enthusiasts to prevent this data loss. Workflow for Using usbloader.bin
The process typically follows a "bootshot" or "test point" method to force the device into a state where it can accept the loader.
Disassembly: The modem must be opened to access the motherboard.
Bootshot Method: A specific "boot pin" on the board is shorted to the ground (often the USB metal shield) using tweezers while connecting the device to a PC via USB. e5573s320 usbloaderbin work
Driver Recognition: If successful, the PC identifies the device as Huawei Mobile Connect - 3G PC UI Interface or similar.
Loading the Binary: The Balong USB Downloader utility is used to select and "load" the usbloader.bin into the device.
Firmware Flashing: After the loader is active, the user can then flash the desired firmware or WebUI using standard update tools. Common Issues and Resources
Bricking: Using the wrong loader version for specific firmware can result in a permanent brick where no lights appear on the device.
Finding Files: Community repositories like forth32's GitHub and forums like Hovatek or 4PDA are the primary sources for these binaries.
Are you attempting to unbrick a dead device, or are you looking to unlock it for use with other network providers?
To get your Huawei E5573s-320 back up and running with a usbloader.bin file, you'll typically use a process called a "boot shot" or "test point" method. This is common for unbricking a device or fixing the "Error 19" issue during unlocking. Preparation & Requirements Flashing firmware can permanently brick the device
Hardware: A screwdriver to dismantle the device and metal tweezers (or a wire) for the boot shot. Software:
Balong USB Downloader: The primary tool used to load the .bin file.
Drivers: Huawei Mobile Connect drivers (ensure the device shows as "3G PC UI Interface" in Device Manager). The File: A compatible usbloader.bin for the E5573s-320. Step-by-Step Guide
Dismantle the Device: Carefully remove the back cover and screws to access the motherboard. Perform the Boot Shot: Keep the battery inside but do not turn the device on.
Identify the boot pin (often the pin closest to the USB port) and the ground (metal casing of the USB port).
Use your tweezers to touch both the pin and the ground simultaneously while plugging the USB cable into your PC.
Verify Connection: Your PC should make a connection sound. Check Device Manager; it should recognize the device as Huawei Mobile Connect - 3G PC UI Interface or USB_COM. Load the usbloader.bin: Open the Balong USB Downloader. Click Detect to find the correct COM port. 2) Obtain the correct USBLoaderBin file
Click the three dots (...) to select your usbloader.bin file.
Click Load. If successful, the progress bar will finish, and your device's LEDs may start blinking, indicating it is in download mode.
Finish Recovery: Once the loader is active, you can proceed to flash the desired firmware using standard Huawei flashing tools.
Note: Newer firmware versions may block older usbloader.bin files. If the loader fails immediately, ensure you have the specific file version compatible with your current firmware build.
usbloader.bin Working?If you followed the steps but still see errors, here is the diagnostic checklist:
| Error Message / Symptom | Likely Cause | Solution |
| :--- | :--- | :--- |
| "No device found" | Driver conflict or wrong USB port | Uninstall all other modem drivers. Use USBDeview to remove old Huawei entries. |
| "Send data timeout" | Wrong usbloader.bin version | Verify the MD5 checksum of your file. Redownload from a trusted source (e.g., 4pda). |
| Tool freezes at 3% | Power loss during flash | Use a powered USB hub. The E5573s-320 draws peak current during loader injection. |
| Device shows "Unknown USB Device (Device Descriptor Request Failed)" | Corrupted NVRAM | You cannot fix this with usbloader.bin. You need a full bootloader unlock via JTAG or a hardware programmer. |
| Loader sends, but router stays dark | Battery voltage too low | Use a fully charged battery. Do not rely on USB power alone for the s-320. |
Once usbloader.bin is loaded, you can:
Balong-USB-Download-v2.exe or similar).USBLoader.bin (or sometimes named usbloader-E5573s-320.bin)..bin file around 20-50MB, containing the OS image).