The bootloader is locked. You can't flash a stock package with root. There's also no exploit to flash any recovery. Read the nice clear threads in the general section like the index and root guide for MK2.
Sent from my SGH-I337 running Blackbox 3.0
Current Device: ATT Samsung Galaxy S4 (i337)
Droid Bionic (GSM Hacked)
HTC Inspire 4G (Desire HD)
HTC Dev Phone 1 (Dream/G1)