Originally Posted by Kopacabana
Well, yes, that's what I meant. I can root the phone then flash a new ROM.
It's not wrong at all! The S3 can be rooted by CF-Root 6.3. It does nothing to the guts of the phone other than allowing root access. It can also be reversed.
You haven't understood me, you don't need to root to be able to flash a rom, you can simply flash a rom without the need to root.
When I said you can't root a phone then give it back to orange that's just wrong, you took that in the wrong context.
What that sentence means is when you root your phone your also voiding your warranty, so it would be stupid to root then just give the phone back to orange, it's also morally wrong (despite your circumstances)