Root [AT&T] Root necessary to install rom?


First let me apologize, i'm sure this was mentioned somewhere, but i did not find the info.

I have a refurbished at&t GS3 on the way from at&t, and my intention is to load Cyanogen 10.1 4.2.2 on it immediately before i give it to my mom.

I haven't root or messed with android in a LONG time.

I looked up a couple tutorials on youtube and the one i'm thinking of specifically makes no mention of needing to root first.

Do i have to root the phone first? Or can i just follow this video step by step.

Much appreciated guys!

heres the video: How to install STABLE CyanogenMod 10.1 Android 4.2.2 Jelly Bean on the Samsung Galaxy S3 / III - YouTube


share the love peeps ;)
Long story short :p
Yeah you need root and custom recovery (CWM or whatever) :thumbup:

P.s, most people dont recommend using Rom Manager on the s3 (i dont know why)
To further what bluebliss is saying, I would recommend, if a clean UI is what you are looking for, you can use a 3rd party launcher to accomplish this. I personally use Holo Launcher HD due to the features available are what I look for. If you want simplicity, this or Nova Launcher would be my suggestions.