Install CyanogenMod 10.1 for Galaxy S3 I9300 [official nightly build]
The CyanogenMod 10.1 nightlies for Galaxy S3 GT-I9300 (intentional variant) is now available officially, thanks to CyanogenMod team. CyanogenMod 10.1 is one of best way to upgrade your Galaxy S3 to Android 4.2.1 Jelly Bean that offers a lot of handy features while nightly build also generates a new build daily to bring new customizations, improvements, etc but bear in mind that since nightly build makes new builds automatically, it may bring bugs.
This guide shows you how to install CyanogenMod 10.1 nightlies for Galaxy S3 I9300, make sure the ClockworkMod recovery is installed on your phone, follow our this guide to install Clockwormod and be sure to make a backup of your device data such as SMS, internet setting, contacts music files etc because the below procedure may wipe data, you can sync your contacts with Gmail account and for messages use SMS apps, lastly use file expert app to backup apps.
DISCLAIMER: Please proceed the below guide at your own risk, Android Egis will not be held responsible if your device lost data or gets damaged following this guide.
Step #2: Transfer downloaded zip files to the internal SD card of device.
Step #3: Turn the device off.
Step #4: Reboot the device into recovery mode by holding down volume up, home and power buttons.
Step #5: In recovery mode, create a nandroid backup of your current ROM, it’s important because if anything not work out that you expect from this ROM, you’ll be able to easily revert back to your current state. To create backup select “Backup and Restore”, and then select “Backup” again.
Step #6: Perform wipe, select the wipe data/factory reset, and confirm on the next screen.
Step #7: Return to main menu by selecting “Go Back”.
Step #8: Select “Install Zip from SD Card” then “Choose Zip from SD Card” and locate the downloaded ROM zip file that you’ve transferred in above step and confirm installation.
Step #9: Repeat the previous step and install the Google Apps package in the same manner.
Step #10: Once the installation is completed, select “Go Back” after that select “Reboot System Now” to reboot phone.
That’s it, enjoy the nightly build of CyanogenMod 10.1. If you experience any error during installation, holler in comment section.