Short the specific point to the ground (the metal USB casing) while plugging it into the PC.

: Ensure all Telstra or other carrier-branded dashboard software is fully uninstalled before attempting to flash, as they can interfere with the COM ports.

: Usually Balgong Flash or Huawei Download Tool (depending on the firmware packaging).

), and enter an unlock code. These codes are sometimes provided by carriers or generated via third-party services using the device's IMEI. Firmware Flashing:

You will need to download the following to a dedicated folder on your Windows PC (these tools are generally not compatible with macOS or Linux):

Locate the firmware application file (usually an .exe installer or an image file paired with a dedicated flash tool). Execute the flashing utility as an administrator.

Your computer must recognize the modem in "Project Mode" or "Debug Mode" to flash it. Plug the E8372 into your PC. Open .

: The flashing tool fails immediately. This indicates a driver issue. Re-run the driver installation package, try a different USB port, or manually assign the driver via Windows Device Manager.

: A high-quality, data-transfer-capable USB cable or a direct USB motherboard port. Do not use unpowered USB hubs.

If you need step-by-step for a specific firmware file, tell me the exact firmware name you have, and I’ll walk you through the flash method for E8372h-320.

: A firmware file specific to the h-320 model that bypasses the factory security checks and has the SIM lock disabled.