Use a metal object (like tweezers) to touch both the boot pin and the ground simultaneously while plugging the USB cable into your computer.
If you are dealing with a "hot" or difficult-to-flash device, here is the technical breakdown of how professionals use the file:
While holding the short, connect the modem to your PC via USB. e5573s320 usbloaderbin hot
The usbloader.bin file is a localized primary bootloader designed for Huawei’s Balong chipset. When your MiFi router is locked by its original carrier (such as Smartbro, Zong, or Beeline), standard over-the-air firmware modifications are strictly blocked.
Unlike standard USB tethering, the (also called Download Mode or COM 1.0 mode ) is a low-level recovery state. To enter this mode on the E5573s-320: Use a metal object (like tweezers) to touch
With the loader active, the device is ready for new software:
Listen for the Windows hardware connection chime, then release the test point bridge. When your MiFi router is locked by its
mobile hotspot when it becomes bricked or locked by a service provider .
The device powers on, the red light flashes 3 times, and then it dies. The WebUI at 192.168.8.1 is unreachable. The standard update.bin placed on a microSD card fails to install. You need the "hot" loader to force a factory firmware via USB.
Modifying firmware and using USB loader binaries can void your warranty and damage your device permanently. Proceed at your own risk.
Open and check the "Ports (COM & LPT)" section. You should see a port labeled HUAWEI Mobile Connect - 3G PC UI Interface or COM Port . Step 3: Inject the USB Loader Open your Balong USB Flasher folder. Open a command prompt window inside that directory.