The official Android 4.3 Jelly Bean firmware for the international Samsung Galaxy S3 (GT-I9300) can be downloaded from several reputable firmware archives. Because the device is legacy, Samsung no longer provides direct hosted links via its main support site, so third-party databases are the standard source. Official Android 4.3 Firmware Sources
Download Link
: Widely considered the most reliable source for official Samsung firmware. You can filter by your specific region/country code (CSC) to get the correct version for your device. The official Android 4
Cons:
Before downloading and installing the firmware, please note that: Extract the downloaded
.zip file → you will get a file ending in .tar.md5 ..tar.md5 file.PASS! – the phone will reboot. First boot takes 5-10 minutes.Preparation: Install Samsung USB Drivers on your PC and back up all personal data, as flashing can wipe the device. Preparation : Install Samsung USB Drivers on your