Galaxy fit Hard reset/factory reset

@vojtech59738 have you tried this yet:

Connect the Galaxy Fit to a smartphone To connect your Galaxy Fit to a smartphone, install the Galaxy Wearable app on the smartphone. You can download the app from Galaxy Store, or the Google Play™ store.

Galaxy Wearable is compatible with select devices using Android™ 5.0 and later, with at least 1.5 GB RAM. Supported devices may vary by carrier. Some features may not be available. For best results, connect with compatible Samsung Galaxy devices. Visit samsung.com/us/support/owners/app/galaxy-wearable-watch for a list of compatible smartphones.

1. From the Apps screen of the smartphone, tap Galaxy Wearable.

2. If necessary, update the app to the latest version.

3. Tap Start the Journey, and follow the prompts to select your device.

4. When the Bluetooth® pairing request window is displayed, confirm the passkeys displayed on your Galaxy Fit and smartphone match, and then tap Connect.

Disconnect

Disconnect the Galaxy Fit from your smartphone.

◌ From Galaxy Wearable, tap the Home tab.

from the user manual