Note: Exact commands/tools depend on the software you choose. Below is a generic sequence.

Follow the prompts. This will remove the carrier WebUI and install a generic Huawei WebUI. Once finished, the modem will restart. 4. Verify the Unlock Insert a non-carrier SIM card into the modem. Plug it into a USB power source. Connect to the Wi-Fi ( 192.168.8.1 or 192.168.1.1 ).

Firmware updates can improve performance, add features, or fix bugs. In some cases, downgrading to an older firmware version may be necessary to enable unlocking or to “unbrick” a malfunctioning device.

| Error | Likely Cause | Solution | | :--- | :--- | :--- | | | Drivers not installed or modem not in download mode. | Reinstall Huawei NDIS driver. Re-enter download mode. | | Flash fails at 2% | Wrong firmware version (e.g., E8372h-153 firmware on a -320). | Find firmware specifically for E8372h-320 . | | After flash, only green light no network | NVRAM corruption. | Flash again, but this time check "Restore NVRAM" with a generic backup. | | WebUI shows "No SIM" after unlock | SIM contacts dirty or firmware has wrong modem configuration. | Clean SIM. Flash an alternative unlock firmware (e.g., "Balong V7R2 Universal"). | | Modem stays in "COM mode" after reset | Bootloader glitch. | Use DC-Unlocker to AT^RESET command (AT command: AT^RESET ). |

: To bypass newer security patches that block unauthorized unlocking, you must flash a specific "transition" or downgrade firmware (e.g., version 21.x).

Before any , you must backup the existing firmware. If something goes wrong, you can restore it.