| Error Message | Likely Solution | | :--- | :--- | | “Port open failed” | Run as Admin or change USB port. | | “Write failed at address 0x…” | Wrong COM port or modem is already unlocked. | | “Code length invalid” | Your unlock code is for a different modem type. |

You can download the Huawei Modem Code Writer V1.0b software from the following link:

: Enter the unlock or service code and follow the on-screen prompts to "Write" the data to the device. Safety and Compliance Note Risk of Bricking

Huawei Modem Code Writer V1.0b - Google Docs (File view/download) 🛠️ How to Use Huawei Code Writer