In Samsung Apps find Gear Manager and it should give you the option to update, do it.
Once app updates and watch has reconnected to phone click on Connected Gear.
From there click Software Update and let it check for update and let it update if available
You should then have the software version mentioned in the first post, to check this. On the Gear find setting, click on it, scroll to About Gear, click on that and scroll till you find Sofware Version