The new software update for Galaxy Watch 1 comes with version number R810XXU1GWE2 and is a small 34MB update. The new update does not bring new features, as its size suggests, it only improves the performance of the sensors. This means that the watch will track activity and health more accurately.
Samsung introduced the Galaxy Watch with Tizen OS 4 in mid-2018. Tizen OS has been updated to version 5.5. The last major software update to the watch was given in November 2021.