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Using HiSuite Proxy typically involves a multi-step process documented in the Complete Guide on GitHub :

When you connect a phone to the official HiSuite application, the software queries Huawei's servers to see if a newer update is available. If you are already on the latest version, HiSuite will prevent you from flashing alternative packages.

HiSuite Proxy acts as a man-in-the-middle between HiSuite and Huawei’s update servers. You point it to locally stored firmware files (or custom URLs), and it tricks HiSuite into thinking the official server sent them.