How to Update Galaxy S3 GT_I9300 to Android 4.2.2 Jelly Bean

1.   
Connect and mount the phone's USB mass storage on computer using original USB cable
2.    Without extracting, copy the downloaded ROM and Google Apps zip files to the root folder on the phone's SD card
3.    Turn off the phone and disconnect its USB cable from computer
4.    Press and hold Volume Up, Power and Home buttons together to boot the device into CWM recovery. Note: Use Volume keys to navigate between options and Power key to select an option in recovery.
5.    Take a Nandroid backup of the current ROM so that it can be restored later if the new ROM fails to work or you want to return to original ROM. To do a backup, choose Backup and Restore, and then click Backup on the next screen. Return to main recovery menu once backup is done.
6.    Perform a full data wipe task as follows: choose Wipe Data/Factory Reset then click Yes on next screen to confirm. Wait for a few minutes until the data wipe process completes.
7.    Choose Install zip from SD card and then click Choose zip from SD card. Now, navigate to the ParanoidAndroid 3.97 ROM zip file that you copied earlier to your phone in Step 2 and select it by tapping Power button. Confirm the ROM installation by choosing Yes on next screen and the installation will begin.
8.    After the ROM is installed, repeat step 7. But choose the Gapps zip file instead of ROM zip to install Google apps.
9.    Once Google Apps is also installed, download and install the NFC-fix. Then return to the main recovery menu and click Wipe Cache Partition and wait until process is complete. Finally, choose Wipe Dalvik Cache under advance option. NOTE: This will prevent intermittent boot loop issues and other ROM related errors.
10. Now, hit reboot system now to boot-up the phone into the newly installed ROM. The first boot may take some time. So, please be patient.
11. Returning to Previous ROM: To restore your previous ROM, boot into recovery, choose Backup and Restore and restore your original ROM by selecting it from the list.
Samsung Galaxy S3 GT-I9300 is now successfully updated to Android 4.3 Jelly Bean based ParanoidAndroid 3.97 ROM. Go to Settings > About Phone to verify the firmware version installed.

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