Objective: I want to root a Galaxy S3 i9300 locked by a carrier and android 4.3
Tried: I tried a method that involved to flash with odin the recovery Philz Touch 6.00.8 but after doing that when I go into recovery mode it doesn't show the install from zip option. So I suppose it means the phone still has the normal recovery and for that reason I'm not able to install supersu from recovery to root the device.
So I decided to do nothing else untill I'm sure which is the correct method to use.
I have read that maybe the CF-Auto-Root method is the one I should use but I want to be sure first. Can CF-Auto-Root method be used on a current 4.3 locked by carrier?
If not which would be the best method to root an S3 i9300 locked by carrier and already with android 4.3?
I would highly aprreciate too if you can tell me what is the best method to generate a full backup before starting to do anything on a not rooted device.