Your watch screen may show an "Upgrading" icon or a progress bar. press any buttons or exit the app during this time. Restart and Sync
Occasionally, a firmware update leaves system logs running continuously in the background, causing severe battery drain.
The official way to update the HK8 Pro Max is via the app. This method is portable as it only requires your phone and a stable internet connection.
Updates often optimize the custom OS, making transitions and animations smoother.