Samsung I9300 Galaxy S III Android smartphone. Announced 2012, May. Features 3G, 4.8″ Super AMOLED capacitive touchscreen, 8 MP camera. Samsung Galaxy S3 I9300 owners has a good news, they can install Android 4.4.4 CM11 M8 KitKat custom firmware. This is not a official firmware update by Samsung, it is developed by CyanogenMod developers. Using this simple guide you can learn how to update Galaxy S3 I9300 To Android 4.4.4 CM11 M8 KitKat custom firmware.
First backup all your contacts, call logs and SMS.
Enable USB debugging mode from Settings->Applications->Development->USB debugging in your device.
Install latest Galaxy S3 I9300 USB drives on your computer.
How To Update Galaxy S3 I9300 To Android 4.4.4 CM11 M8 KitKat Custom Firmware
2.Connect your device to computer and transfer the downloaded files to your internal SD card and make sure the files are in the SD card root.
3.Disconnect device from PC and turn off the device.
4.Now enter into bootloader mode by pressing and holding volume up+volume down and power buttons together.
5.Now enter into bootloader and go to recovery option. Here perform a full data wipe by selecting “wipe data/factory reset”, cache wipe by selecting “wipe cache partition” and also perform wipe dalvik cache .
6.Now go to main screen and select “install zip from SD card”. Navigate using volume keys and select Android 4.4.4 ROM zip file that you copied to your SD card and select it using the Power button.
7.Same procedure (step 6 only) is applied for Google Apps package also.
8.After installations go back and reboot the device.
For the confirmation go to Settings>>About phone to verify the firmware update.