: There are multiple versions of the HK8 Pro Max (v1, v2, and the newer "Ultra 2" variants). Flashing firmware meant for a different revision will cause the screen to stay black.
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When the HK8 Pro Max leaves the factory, it often ships with a "stable but basic" version of firmware. This version gets the job done—it tells time, tracks steps, and shows notifications. But users who demand accuracy, fluidity, and extended battery life know that high-quality firmware is non-negotiable. : There are multiple versions of the HK8