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You need a .bin firmware file for your specific E5172 model. Common stable versions: download huawei e5172 firmware upgrade tool
Right-click the downloaded Huawei_Multicast_Upgrade_Tool.exe and select Run as Administrator . This public link is valid for 7 days
If your router is still functional and you simply want to install a newer version, you can bypass the multicast tool entirely. Connect your PC to the router via Ethernet. Open a browser and navigate to 192.168.1.1 . download huawei e5172 firmware upgrade tool