Updating to Android 4.2.2
You will probably lose your photos and music, which is why when you root your phone you should do a backup, like a Nandroid back up or Titanium Backup, Nandroid is better. You should also save all your files that you need to your computer or on an online storage account before rooting. Then after you've flashed your ROM you can get those files back. As for your contacts they shouldn't be deleted if you have a Google account and it is backing up your essential stuff, basically all the Google stuff. You can check if you have this backup enabled by going to settings, then backup and restore, then make sure you have "backup my data" (Back up app data, wifi passwords, and other settings to Google servers) this will include your contacts. Then there is an option for "Automatic restore" (When re-installing an app, restore backed up settings and data". There is also an option that says "backup account" make sure your GMAIL account is displayed, if not, add one and then wait a couple hours for the data to be backed up before rooting/flashing. If you want to be 100% sure you won't lose your contacts go to Google and type in "Google Contacts", sign into your Google account and see which contacts are displayed, if they're there then your backup has worked, if not then you might have to manually add all your contacts to Google Contacts and they will show up on your phone when you sign into it using that Google account.
Good luck! Rooting is amazing! Don't be afraid!
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