I tested this tutorial in my Gear S3 Frontier R760, Tizen 3.0.0.2, Rom R760XXU2CRC3
I do not know if this tutorial works in any version of firmware but you can try.
1)Go to settings/about gear/ and activate "Debugging"
2)Go to settings/connetion/Wi-Fi/ and set to "always on" then connect to your preferred network.
3)Go to settings/connetion/Wi-Fi/Wi-Fi networks/your connected network/ and scroll down until
you find "IP Address" and save somewhere that address.
4) Download to your Desktop "sdb tool" from here and extract the arhive SDBstarterKidv1.zip,
in the extracted folder you will find more archives.
You have to extract sdb_2.2.60_windows-64.zip if you are using 64 bit Windows or sdb_2.2.60_windows-32.zip
if you are using 32 bit Windows. I will use in this tutorial the version for 64 bit Windows.
5)Navigate to: C:\Users\EMP83\Desktop\SDBstarterKidv1\sdb_2.2.60_ windows-64\data\tools
and launch the command prompt here.
6)Enter 1 by 1 the following commands:
6a)
HTML Code:
sdb shell
after this command you will be prompted by windowsfirewall and you have to hit "Allow"
6b)
HTML Code:
sdb connect 192.168.1.73:26101
change 192.168.1.73 with ip address from your watch (the one you saved earlier from Wi-Fi settings).
after this command you will be prompted in your watch to allow a RSA Authorization Key( you must allow it)
6c)
HTML Code:
sdb shell
6d)
HTML Code:
launch_app csc-manager.csc-pre-configuration
after this command a list with all available csc should apear in your watch. Select the one that you whant.
I changed from United Emirates Arab CSC to France CSC.
after this step all your data will be deleted and the devicereset to factory settings.