Why is this a game-changer? Because the HK8 Pro Max is a "portable" device by nature. You shouldn't need a desktop to maintain it.
Your watch screen will usually show an arrow or a loading bar. Do not close the app or turn off the watch during this time. Troubleshooting Common Issues
You tried the HK8 Pro Max firmware update portable method, and now your screen is black or displays static. Do not panic. You have not bricked it.
Because the HK8 Pro Max is a "clone" device (different factories produce slightly different internal hardware versions), (often labeled as .bin or .ota files) and try to force them onto your watch using third-party tools.
Updating your firmware often resolves existing bugs and adds new features: Customization