Samsung Galaxy S3 Android 4.1 Jelly Bean SDK Port
The Android 4.1 Jelly Bean is so sweet that developers can’t wait to put this operating system on the devices running Ice Cream Sandwich already. While HTC One X got Jelly Bean SDK Port awhile ago, now what it looks like Galaxy S3 Jelly Bean update has also been ported from XDA Developers team via faryaab.
This thread of Jelly Bean is for Galaxy S3 international variant. Everything from ADB, Touchscreen, Hardware Acceleration, Notification LED, Physical Buttons, SMS, Accelerometer, Charging to Cellular Rado (But No Audio so no Calls) works fine, while some features such as WiFi, Bluetooth, NFC, audio, camera, and storage have issues with this update.
Well if you don’t mind these things not working, the build, based off of the Galaxy Nexus Jelly Bean OTA, can be grabbed by hitting the source link below. Though, I recommend you to act carefully and read through the thread for instructions and feedback.
Source - XDA Developers