I9100XXKG2 is latest firmware available for I9100.
Main Changelog -
1. More Refined, smoother and feels like a release version.
Eg. Phone is asking for calibration before enabling motion.
2. Gtalk video works. (available since KG1)
3. No more Android OS Bug (thanks to 2.3.4)
4. Home button delay fixed
5. Data speed improved
6. Much stabler 3G/H/H+ connection. It doesn't switch between 3G and H / H+ that much anymore.
7. FM radio controls on lock screen.
8. CPU time for Android OS is still high but less than before. KF3: 10 min/hour, KG2: 7 min/hour.
9. Battery life seems better and lost less juice during idle. KE7: 2%/hour, KF3: 1,2%/hour, KG2: 0,8%/hour
For details and procedure video visit http://www.dialandroid.com/2011/07/i...droid-234.html