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Manually Updating Software on the Index S2 Smart Scale
Remove the battery cover.
Remove one battery from the scale.
This may be a good time to consider replacing the batteries in your scale.
Press and hold the Reset button while inserting the battery.
Let go of the Reset button once the scale turns on (approximately 2 seconds).
Press the Reset button to cycle through the screens. Stop on the screen displaying a gear icon.
Press and hold the Reset button until you see a gear icon flashes, and Wi-Fi sync starts in the top left of the display.
Release the Reset button.
Your scale will proceed to display a sequence of 3 progress bars as it completes the software update. If the screen turns off during the update, tapping it will display the progress bar.
Do not remove any batteries or try to take a weight measurement while the scale is updating.
Once the update is complete the scale will power back on like normal and you can take a weight measurement to sync the updated version to Garmin Connect.
NOTE: Your scale forgets all users on the device when any reset is performed. You will need to have all guest users remove the scale from their Connect profile and send them a new invite. Adding or Removing Additional Users to an Index Smart Scale
Garmin Support Index S2 Updating Software