I have a root sg3

[droid1987]

Ok when jelly bean get sent to the phone should unroot it befor installing it. Or can I just install it and it will be unroot.

[squeekybigfoot]

if you want to prevent any issues and stay on the safe side id unroot it, unless you manually install a jelly bean rom than you'd need to be rooted with a custom recovery.

[bsweetness]

Moved to the Galaxy S3 Development forum.

[droid1987]

I just flash stock image right

[squeekybigfoot]

How to unroot/ unbrick galaxy s3 SCH-I535 back to factory.

Yup, download the stock rom from the tutorial page and make sure you have all the drivers installed.

[mikemartin9]

Ok when jelly bean get sent to the phone should unroot it befor installing it. Or can I just install it and it will be unroot.

I have have had no problems doing OTA upgrades on a rooted Unlocked Phone using clockwork mod as my custom recovery, just deny the request to remove clockwork mod and re-lock the boot loader, the phone will say the update has failed but all will be ok, this included the jelly bean update