Extract the downloaded Android 4.3 firmware ZIP file on your PC. You will get a .tar.md5 file. Open as an Administrator.
Go to Settings > About Device and confirm your model is precisely GT-I9300 . Do not attempt to flash this firmware on LTE variants (like the GT-I9305) or carrier-specific US models, as doing so will permanently brick the device. Extract the downloaded Android 4
The official Android 4.3 firmware for the Galaxy S3 GT-I9300 is available for download from the Samsung website. You can download the firmware using the following link: Extract the downloaded Android 4
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