Here is all you need for the stock firmware ROM for Samsung Galaxy S3 International version FT-I9300. Below are the stock firmware ROM for different region who are using international version of SGS3. These all Samsung Galaxy S3 stock ROM are original and same as what you have when you first bought your SGS3. In case, you need to reset your SGS3 to factory settings for reselling after rooting or flashing custom ROM, this is what you need to look for. I tried to find the tele company website to find the stock firmware but seems like it was not available. To play safe, you should keep a copy of stock firmware below for future use.
Please take note:
In case you have not done any rooting, flashing kernel, custom ROM or any firmware, always remember to record down your original firmware details like model number, android version product code, firmware and kernel versions as they are references for you to re-install the correct stock firmware rom back to your SGS3.
To check your photo details, simply go to Settings->About Phone.
Download Firmware Builds: