Remove the SIM card from the modem or insert an unsupported carrier SIM. Plug the Huawei USB dongle into a USB 2.0 port on your PC.
| 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. |
Do you already have the calculated from your IMEI?
Do you need help for your specific modem's IMEI? HUAWEI MODEM Code Writer Download Download Huawei Modem Code Writer V1.0b
The official Huawei Mobile Partner dashboard or standalone handset drivers must be installed so Windows can recognize the modem's PC UI Interface.
This article provides a comprehensive overview of what the tool does, how to use it safely, and what to expect during the unlocking process. What is Huawei Modem Code Writer V1.0b?
: Only download the utility from trusted repositories or community forums, as some older versions may be password-protected or bundled with unnecessary software. Code Accuracy Remove the SIM card from the modem or
Huawei Modem Code Writer V1.0b is a legacy software utility designed primarily for technicians and advanced users. Its core function is to write , firmware , or device configurations directly into the modem’s internal memory (EEPROM or flash storage).
Do not use V1.0b on LTE or 5G Huawei modems (E3372, E5573, etc.) – it will almost certainly brick them. This tool is strictly for 3G/early 4G (non-Balong) chipsets.
Windows XP, 7, 8, 8.1, 10, or 11 (32-bit or 64-bit). | | “Write failed at address 0x…” |
Paste or type the 8-digit or 16-digit NCK unlock code into the text field. Write Code: Click the "Write Code" or "Unlock" button.
Automatically or manually scans for connected Huawei mobile broadband devices.
You must already possess the unique NCK/Unlock code for your modem's IMEI. You can calculate this using online IMEI tools or request it from your network operator. Step-by-Step Guide: How to Use Huawei Modem Code Writer
For best results, use it as an to understand the mechanics of modem unlocking, but for the actual unlocking of a Huawei modem, modern solutions like DC-Unlocker are highly recommended. If you choose to proceed with this software, do so with extreme caution and full awareness of the risks involved.