Default S3 Rebooting after trying to sideload

I have just rooted my S# GT-I9305T using SkipSoft program and worked fine. I then tried to sideload SuperSu as I had 2.01 version. Now I did that the phone keeps rebooting showing the S3 screen then tries to go into Teamwin and loops cant get it to boot up. Can someone please help. If I hold the volume button and power button and home button it boots into a screen that says Warning Custom OS can cause problems.....Volume Up Continue Volume Down Cancel If you goto Up then a screen pops up and says Downloading and looks like nothing happening. Goto Down and starts to loop again