How to upgrade Android for Samsung Galaxy S3 i9300

I decided to upgrade Android in my Samsung Galaxy S3 i9300 from version 4.3 to a higher version which is not officially supported by Samsung. See also Wiki on this page.

How to install a new version of Android to your mobile

TODO

How to install an official Samsung firmware back to your mobile

1. Download Odin flash tool.
2. Download an official version of Samsung firmware.
3. Unzip the downloaded file on your PC.
4. Enter download mode.
5. Connect mobile and PC with a USB cable.
6. Run Odin and you should see Added!! in Odin log.
7. Click on AP button in Odin and choose md5 file you have unzipped.
8. Wait until the md5 file is loaded.
9. Click on Start button and wait until you see PASS!

Troubleshooting

How to resolve Android boot loop issue