Stock Firmware For SM-R840
This is the stock firmware for SM-R840 Galaxy Watch 3 45mm. It can be used after changing the CSC of watch or if the watch is not working properly you can still flash this software via the WiFi Net Odin in order to get a fresh install of Tizen on you're Galaxy Watch 3.
Once again the file is only for the Galaxy Watch 3 SM-R840 Model before downloading or using make sure to check the model number of you watch it's present in Settings>About Watch>Model Number
Link To Download The Firmware