If you want, I can:

| Error Code | Meaning | Solution | | :--- | :--- | :--- | | | Wrong code entered multiple times. | Unplug the modem for 24 hours to reset the attempt counter. Do not try again. | | Code 04 | Permanent lock / PUK required. | The device is bricked from too many bad codes. Only a factory reflash via JTAG can save it (not cost-effective). | | No Service | Unlocked but bands mismatch. | Your new SIM’s LTE band isn’t supported. The E8372h-320 lacks band 28? Check frequencychecker.com. | | USB Not Recognized | Driver conflict. | Uninstall all Huawei PC Suite software. Use Zadig to install WinUSB drivers. |