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While third-party sites might host firmware files, the safest way to obtain "free" firmware is directly through Huawei's official support infrastructure to avoid bricking your device or compromising security.
If your ISP (Internet Service Provider) has not pushed an update, you can check the Huawei Enterprise Support Page . How do I update the firmware version of my HUAWEI router
The easiest method is to let the router handle the update itself.