After being denied from the Samsung for official Android 4.4 update to Samsung Galaxy S3. Here come a senior XDA developer, “arter97” who has ported the Korean Galaxy S3 Kitkat ROM to the International Galaxy S3 I9300. Initially the Ported ROM was unstable as it consists several bugs but now it is fixed and is available via the source links below.
The Korean Variant of Galaxy S3 from which Android 4.4 is ported for Galaxy S3 International is running on 2GB of RAM unlikely of 1GB on International Variants. Let’s not creating an issue as new entry level phones are also running Kitkat on 1GB RAM smoothly. So we can say on Galaxy S3 can run Kitkat smoothly.
As said above, earlier, there were some bugs like SMS messaging issues, signal issues in the ported ROM but an updated version 2 has come out fixing those things.
If you’re interested in flashing the Android 4.4 ROM on your device then click the source link below.