Here is the pin-out diagram drawing of Samsung Galaxy Watch Model SM-R800. Although all Samsung Products are coming with a USB cable connectivity with computers, so you can flash your device with firmware and reset it to factory setting. But unfortunately Samsung Watches doesn't not come with such ability. In most of these watches user need to connect the watch by a wireless connection. And it does need a computer with wireless connectivity. Well sometimes your wireless connection might break or your watch get bricked and you will have no way to connect your watch by a wireless connection.
Guide to Connecting a Samsung Gear S2 and S3 Device Using Wi-Fi Here you will learn how to connect a Samsung Gear S2 and S3 watch to a Host computer by your local wifi Wi-Fi Connection or by a wire. You will need to have a computer, a router or access point and your watch as described in this figure 1
By this method you will be able to put your watch into download mode and install firmwares by wires that you will need to solder inside your watch. In case your watch keeps rebooting over and over and then dies, or you can't connect over wifi/bluetooth connection or you had an update and crashed your watch, so here is the method used to fix that problem.
Finally Samsung Gear S3 reactivation lock got unlocked. And there is way to reset reactivation of Samsung Gear Watches. Below is the method used for this purpose. This solution will help to reactivate a locked google account of watch. You need to download a Combination , and Firmware files and some other files used for this method.