its possible to use this method for update gear fit for non samsung device?
the guide step this:
Find a S5 or Note 3 in a carrier store, best buy, or a friend.
Connect your Gear Fit to that device either by using the APK below or downloading it from the Samsung Store on that device
Go through the setup and update the Gear Fit.
Yes that step is mandatory becuase you can't update the Gear Fit using a non-samsung device.