By short-circuiting specific hardware contacts on the motherboard (known as the ), you force the chipset into an emergency download mode. In this mode, the hardware looks for a temporary loader file over the USB serial port.
While keeping the points bridged, plug the USB cable into the PC.
If you are looking to unlock your device, you might want to look at tutorials for the specific network your Huawei E5573s-320 is locked to, such as a Smartbro modem to know if you need to use this technique. YouTube·Movie ShortCuts e5573s320 usbloaderbin work
Before diving into the flashing process, let’s understand the hardware.
Locate the bootshot pin (on the E5573s-320, it is usually the single small golden pad closest to the micro-USB port structure). If you are looking to unlock your device,
Look for a device labeled HUAWEI Mobile Connect - DownLoad Port or a generic USB Serial Port . Note down the assigned COM port number (e.g., COM3 ). 4. Flash the usbloader.bin Payload
What is displaying on your computer screen? What color or behavior are the LEDs on your router showing? Look for a device labeled HUAWEI Mobile Connect
: Specifically the DataCard driver and the FC_Serial_Driver_Setup required to correctly parse COM ports.
In all these cases, the usbloader.bin acts as a low-level loader that communicates with the device’s CPU before the main firmware loads.
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