Help incomplete unrooting... help

[Noah44]

Samsung Galaxy S2 (SkyRocket)
Android 4.1.2
Was Rooted with SuperSU (and BysyBox)
Provider AT&T

Recently AT&T start distributing update. Yes it downloaded it
but after reboot, it said "update failed". Yep. my phone was rooted.
So I decided to unroot it via SuperSU (settings/ unroot completely).
That went fine.
I waited 24 hrs for AT&T permision and try update again.
when the phone rebooted, it started with "teamwin recovery project"
I tried to choose install, and chose update.zip.
Skipped installing SuperSU and rebooted.
However I got the msg from AT&T "Install interrupted"

BusyBox is still in System/xbin. I am unable to delete it (or do not know how).

Any help Ideas?

Thanks

Noah44

 

[AMOCO]

Hi Noah44,I would do this:
http://www.addictivetips.com/mobile/how-to-return-to-stock-unbrick-att-galaxy-s-ii-skyrocket/