Default [Q] I337 Help...Will not boot

Any help would be greatly appreciated. I have an I337 running on AT&T I337UCUEMK2. I was rooted with no problems whatsoever. I rebooted the phone & now it gets stuck at the att globe screen and will not go any further. I have gone into recovery & factory reset & reset cache but neither work. I have tried to sideload the same ota firmware but get fail message "assert failed: apply_patch_check". Is there any way that I can get my phone working again? I have searched everywhere, but I have found nothing...